Compact. If you find that your Flexicom boiler has stopped working it may just be that the system pressure has dropped Feb 22, 2024 · Glow-worm Faults. Turn off the power to the boiler so's it doesn't fire up for any reason (pump anti-seize, etc). If there is a fault in your boiler there are various codes that could appear on your dial. Although boilers lose pressure over time, a rapid drop might mean there’s an issue with the system, most likely a leak. 5 on the pressure gauge. The boiler comes equipped with sensors that continually monitor the water pressure to ensure that it remains within a particular range. Is this too high ? 1y. Never modify the factory setting of the gas pressure regu- Record the boiler maximum gas flow rate onto the lator of the gas valve assembly. It’s sturdy and reliable, delivering the reliability your customers love. This type of boiler is perfect for supplying hot water to multiple bathrooms simultaneously, even in areas with low water pressure. The remaining circulating pressure head available from the boiler is shown in diagram 4. Glow-worm; Contact Us Feb 15, 2023 · What to do if your boiler has low pressure. Includes boiler, clock & standard horizontal flue. In fact, it can supply enough heat and hot water for a home with four bedrooms and multiple showers and bathtubs. In addition, it includes a 10-year manufacturer’s warranty. The cost of a Glow-Worm combi boiler can be influenced by several distinct variables: Boiler output: For a dwelling of average size, such as a 3-4 bedroom home, a 30kW boiler like the Glow-Worm Ultimate3 is suitable. Jun 10, 2024 · The Glow-worm F22 fault code, like the Vaillant boiler F22 fault, indicates low boiler pressure and must be repressurised to fix it. In most glow-worm boilers, the pressure gauge can be found on the front panel or control panel. ”. 8 Checking the burner Search the surface of the burner for possible damage. While its customer score of 74% is lower than the likes of Vaillant and Worcester Bosch, it's comparable to other budget-friendly brands like Ideal and even higher than others like Potterton. Stuck or Damaged Diverter Valve: Essential for directing hot water, if stuck, the boiler may cease to function. Combi boilers are by far the most common type of boilers in the UK. Big thumbs up… Compact Design. It's a Glow Worm 18SXI and apart from the filler loop (which is disconnected) has no other connection to the mains. They do not include installation costs. 5 Expansion Vessel - The heating safety valve opens when the pressure in the heating circuit exceeds 3 bars. Also for: 35hx, Flexicom 35hx, 15hx, 18hx, 24hx, 30hx. Here is a list of the exact faults from Glow Worm boilers – Most faults will require a Gas Safe registered heating engineer so that is the reason why there isn’t a suggestion for what you should do in these scenarios. Description GC Part No. 3. This boiler was working fine this winter, is usually set the heating temperature to 45 degrees. Compact, smart design to suit modern homes. Our Energy combi boiler is built right here in the UK at Glow-worm’s award winning factory in Belper. gether with the condensate tray. 10 year extended guarantee is only available for boilers Page 49 MAINTENANCE Short List of Parts • When ordering spare parts, contact Glow-worm’s own service Part No. Isolate the flow and return valves under the boiler and drain the boiler from a drain off on the flow or return. 10 Aug 2017. Turn off the flow and return CH pipes under the boiler - there should be quarter-turn valves fitted. Pressure is created by the water content in the The Glow Worm Betacom 30C’s and the 24C’s are high-quality boilers but they often are faulted with intermittent operation. en Operating instructions. 3. Our dependable, high-quality gas system boilers will ensure that you’re never caught short. Another way to reduce the pressure is to take off the front cover of the boiler, two screws at the bottom and lift off, is to use the Pressure Release Valve (PRV) it is a red handled valve on LHS, press down briefly and watch the pressure drop on the display. It’s also a dream to install, saving you time, hassle and bruised knuckles. Glow-worm is very positively reviewed with an Excellent rating on Trustpilot and a Apr 12, 2024 · A Glow-worm boiler not firing up with no fault code might be attributed to several factors: Blocked Plate Heat Exchanger: The transfer of heat could be hindered, preventing operation. Before operating your GlowWorm heat only boiler, familiarise yourself with the controls. But today the weather was pretty warm so I lowered the temperature to 22 degrees for the afternoon. The Glow-worm Energy 30C is compact, measuring only 700 x 390 x 280. Unscrew the gas connection pipe's connection (1) from the gas valve assembly. The main problem here is that it’s a very generic code which can point to a few different faults relating to pressure, circulation and diverter valve issues. It’s the most compact and lightweight boiler we’ve ever produced, but don’t let its stature fool you – this boiler delivers big performance. Disconnect the connection (2) and the earth cable (1). If the issue is a frozen pipe, you can try to thaw it out using hot (not boiling) water. If you see any damage, replace the burner. Nov 30, 2023 · F9 on a Glow Worm boiler is one of the most common fault codes. Note: the prices listed below are the purchase prices for the boiler only. a year ago. Dip a cloth in a solution of water and solvent-free soap at a ratio of around 2 tablespoons (30 mL) of soap per 4 c (950 mL) of water, and wring the cloth until it is damp. 5 bar close both valves; Reset the boiler (if needed) Turn The fault code on the screen may indicate if the sensor has a problem. 2 Operating Concept. The Ultimate₃ System boiler provides outstanding heating performance in a 25kW model, and is suitable for homes with high hot water demands (when combined with a hot water storage cylinder). • Should there be any discharge from the pipe, isolate the boiler electrical supply and call your installer or Glow-worm’s own service organisation. Jan 4, 2016 · Glow-worm's Ultracom range of high efficiency boilers was one of the most popular boiler ranges available on the market, designed with straightforward instal If your boiler pressure drops below a certain point, you will not have hot water or heating. As the pioneers of heating in the UK, we are proud to offer a wide range of high-efficiency Page 1: Ultracom Cxi. Please read these instructions and follow them carefully for the safe and economical use of your boiler. If the pressure falls below this threshold, the boiler responds by triggering the F9 fault code, shutting down to prevent High efficiency sealed system boiler from Glow-worm. Combi boiler range with the choice of 24 or 28 kW outputs. Examine the exterior of your boiler for corrosion or damage to any connections going into or out of the unit. Download this manual. Glow Worm boiler Service Cost. If you have an old Glow Worm boiler and the pressure is Apr 4, 2022 · Resetting a Glow-worm boiler is simple. May 29, 2024 · In this article: Please select. This means you can control your heating and hot water from anywhere at anytime by simply using your mobile phone or tablet. Fault code F9. organisation. 1. Ultracom cxi High Efficiency Condensing System Boilers Instructions for Use To b e l e f t w i t h t h e u s e r www. Benchmark gas boiler commissioning checklist. Aug 10, 2017 · Country. You can see what each code means here. In terms of energy efficiency, this combi boiler proudly bears an ErP A-rating. With a stainless steel heat exchanger, it Nov 8, 2023 · Lastly, it is vital to address dirt or carbon build-up in the burner. 24c-AS/1, 28c-AS/1. Mar 6, 2024 · Price Factors for Glow-Worm Boilers. heating spares. Check if the boiler display is active and showing the correct information. The Ultimate₃ also comes prepared with a 5 year May 12, 2023 · Key Takeaways. 0 bar” fault on a Glow-wor This manual is also suitable for: View and Download Glow-worm Flexicom 12hx installation and servicing online. Next is the dreaded F9 code. May 12, 2024 · Is your Glow Worm boiler flashing an F22 fault code? Don't worry, we've got you covered with some easy fixes! Apr 26, 2022 · But not all new boilers come with a Quiet Mark certification, whereas the Glow-worm Energy 30C does, partly thanks to its ultra-quiet, automotive-grade aluminium heat exchanger. The boiler has built up too much pressure. On average, a Glow-worm boiler (with installation) will cost you between £800 and £1100. Free 5 year out the box guarantee. HiHow to re pressurise your combi boiler Feb 19, 2024 · The Glow-worm Ultimate₃ is designed with a 30kW heating output capability, extending its suitability to average-sized UK domiciles, typified by 3-4 bedroom semis. The loop should have two valves, they are both opened to raise the pressure to specified amount, then closed. 5 bar on the gauge when the radiators are cold. Glow-Worm S202201 Air Pressure Switch. Glow-worm is owned by Vaillant, but it offers more budget-friendly options than the boilers made by its parent company. Page 28 12 Troubleshooting 13. Once you know that the drop in pressure hasn't been caused by a leak, or a leak has been fixed, you can re-pressurise your boiler to bring it back to the normal level (1 bar) – check the instructions that came with your boiler to find out the boiler pressure recommended by the manufacturer. It is likely the radiators will need vent and more water introduced to raise the pressure back up. 0161 620 Features & benefits. Remove the plug from the gas valve assembly (3) and from the fan (4). The main advantage of a Glow-worm regular boiler is that it can supply hot water to multiple taps at the same time, even in areas with low water pressure. If your Glow Worm boiler is relatively new always check your Glow Worm Apr 9, 2024 · Your Glow-worm boiler should register a pressure between 1 and 1. How to reset a Glow-Worm boiler: Locate the reset button on your boiler. It works on indirect sunlight that recharges the small PV cells. net. Sep 18, 2019 · Derek in this episode of inside the boiler casing takes us through the workings of the glow worm cxi condensing combination boiler giving us tips and informa Oct 25, 2023 · Fault: Cause: F23: Problem with the circulation pump: Possible Causes – Blockage in the pump- Impaired impeller or motor- Faulty wiring or connection Sep 12, 2017 · Has your boiler stopped working and is showing " 0. Energy is a light and compact boiler with a choice of rear or top flue making it easy to install in any situation. 10. The boiler will make a noise as it resets. The right boiler pressure is between 1 to 1. Slowly turn the valve until water starts to drip out. Remove the air intake pipe (2). Switch the boiler back on and, if needed, press the reset button. Sep 13, 2022 · To check the pressure on a glow-worm boiler, you will need to locate the pressure gauge. It is a good idea to regularly check the The Glow-worm Energy 25C combi boiler is a great choice to replace your old boiler. It’s perfect for small homes and apartments, as it takes up little space. 1 Appliance description The Betacom2 range of boilers are designed for use as part of a Jan 6, 2010 · 9 Mar 2016. Once they are cool, locate the bleeder valve on each radiator and use a radiator key to open valve. They often display F16, F62 and F63 fault codes. Betacom Installation and Servicing G. 5bar) and reset boiler: Betacom May 17, 2022 · A Glow-worm boiler reset button is used to reset tripped safety switches and resume operation after a fault causes shutdown. They are suitable for homes with 10 to 15 radiators. Slide the pin for the time interval, in which the heating mode should be switched off, inwards (5). #3. Cleaning your boiler will keep it in good condition to help it last a long time. Replacement of pressure sensors on Flexicom, Ultracom and Betacom 2 boilers Jan 17, 2013 · Glow Worm Swiftflow 80 Combi boiler -pressure drop becoming more frequent and after topping up to the correct level the pressure goes too high (2. It is usually a small circular dial with pressure values marked on it. *FREE 5 year standard guarantee available. However, what you are targeting when repressurising is around 1. 1 bar and is flashing. 10 year extended guarantee is only available for boilers registered through Club Energy Key features and benefits. Undo both ends of the filling loop and remove from the pipes. Simply type your question and click "Ask", or browse the Top 10 Questions from other visitors. Or, you can drain the central heating system. 4bar the display will flash the current pressure and the boiler will not operate, refer to fault finding section. If this is the case, we will advise you on a suitable replacement boiler for your home and you will only be charged £99 for the engineer’s time. A lack of safety devices (e. However, the problem can manifest even with fault codes F67, F65 and F64. It is possible that the engineer didn’t top off the boiler’s pressure before they worked on it, however, it is possible that the boiler was working fine before the fault occurred, but then suddenly shut down due to low pressure. 0020136541 Plate to plate heat exchanger 30c • Please quote the name of the appliance and serial number, to 0020173017 Plate to plate heat exchanger 35c be found on the data label. A Glow-worm sensor is a pressure sensor which manages the pressure of fluids like air, gas, or water within your boiler. 47-019-08 G. If you hear the heating process begin and the pressure reading on the front of the unit does not change, then it is likely that the sensor has failed and the F75 code will be displayed shortly thereafter. In summary, understanding the various causes and potential fixes for the F29 fault code is crucial for Glow-Worm boiler users. Typically, you will find controls for temperature settings, heating, and hot water functions. If the pressure hasn’t dropped but then does when the isolation valves are opened then it indicates a leak on the radiators or pipework. 6 Risk of death due to lack of safety devices. Here are the steps for repressurising a boiler without a filling loop: 1. Glow-worm regular boilers are ideal for larger households with multiple bathrooms and a high demand for hot water. Jan 4, 2016 · Glow-worm's Energy range of boilers is one of the most installer-friendly boiler ranges available on the market, designed with straightforward installation a For most boilers the pressure should typically be between 1-2 bars. This achievement signifies a high level of efficiency, translating into reduced energy consumption 1. Mar 11, 2023 · Are you getting a Low Water Pressure Fault Code F22? or just looking to top up the pressure on the Glow-worm Flexicom Combi boiler?This video shows you where Jan 18, 2024 · This can often resolve minor problems such as low water pressure or a faulty thermostat. It ensures that, if the fan fails within the boiler, there would not be a build up of toxic gasses with no means of diverting them out of the property. These instructions are an integral part of the boiler and must, to comply with the current issue of the Gas Safety (Installation and Use) Regulations, be left with the user. First, turn off the heating system and allow the radiators to cool. 3 Frost protection The frost protection system operates the pump to start as soon Glow-worm products. 5 bar close both valves; Reset the boiler (if needed) Turn Feb 22, 2024 · The Glow-worm F22 fault code, like the Vaillant boiler F22 fault, indicates low boiler pressure and must be repressurised to fix it. 0161 620 6677 Page 2: Guarantee Registration Guarantee Registration Thank you for installing a new Glow-worm appliance in your home. Table of Contents. It has an aluminum heat exchanger designed to last longer – and save you money, at the same time. 10 Inspection and maintenance 10. If the pressure has dropped then it indicates a fault with the boiler (prv or heat exchanger). We are able to repair any domestic Glow-worm boiler unless it is uneconomical to do so. It uses an aluminium heat exchanger which is designed to last longer and reduce your energy bills. #4. 1, Glow-worm pump. The pressure is steadily increasing by about 0. The purpose of a pressure relief pipe is to allow water to be removed from the system if the boiler pressure gets too high. See if the pressure still increases. The first thing you need to do is check the pressure gauge and if it’s low, repressurise it until it’s at 1. Insert the filling key into the keyhole to unlock it. 9 Checking the ignition electrode Remove the gas-air mixture unit (6). Flexicom 12hx boiler pdf manual download. If you’re unsure, check your boiler manual. Nov 30, 2023 · The Glow Worm Wireless Outdoor Sensor will help you make your boiler run at its maximum efficiency and save more cash on your monthly bills. 0 bar ". betacom boiler central heating system drained engineer glow-worm high oil pressure water. Press and hold the reset button for 10 seconds. Hold a cloth or rag under the valve to catch any water that may drip out. . Apr 11, 2024 · Glow-worm combi boiler prices range from £550 to £1,555 determined by the size, Kw output and flow rate. It is typically a red button located on the front or side of the boiler. www. Be careful to catch any water spillage and remember to keep the loop in a safe place. Specifications. co Tel. ErP A rated for efficiency - helping you to reduce energy bills. Check the pressure the next day. To check if the Glow-worm Ultracom2 30sxi boiler is functioning properly, you can follow these steps: 1. . 4 Guaranteeing the Filling Pressure of the Heating Installation. A standard Glow Worm boiler service costs £90-£125. Press and hold the reset button for 5-10 seconds. Lift the heat exchanger up slightly and remove it to- Undo the nut (3). If fault persists contact your Installation/ Servicing company or Glow-worm Service. Exceptionally quiet operating volume. Although Glow-worm is not considered a premium boiler manufacturer, some of its models compare favourably with much more expensive and recognised brands. The automotive grade aluminium heat exchanger has large waterways making it perfect for retrofit jobs. It is easy to solve this loss in pressure by topping up your system - your installer will be able to do this quickly. Aug 14, 2015 · Ok, try this. 2 Introducing your appliance 2. Hi I'm Dave at G20 Gas Services in Manchester. Feb 15, 2021 · I'm the head tenant of a shared house in Dublin, which is heated with a Glow Worm Home 15s boiler. Nov 13, 2015 · Here is emh homes guide to your Glow Worm boiler, showing you how to use it and get the most out of it to keep warm and comfortable all year round. When fitting the boiler into an existing system, special care should be taken to drain the entire system, including radiators, 4. The heat exchanger is also super quiet – you’ll barely even hear your boiler when it’s on! The compact size and rear flue option gives it 1 Display and Control Elements. You can change your cookie settings at any time by clicking “ Preferences . Mar 7, 2024 · Low pressure in a boiler is what causes a Glow Worm f22 fault. 3 Setting the Heating Flow Temperature. There should be a filling loop between the cold water supply and central heating return. I will show you simple step by step instructions on how to fix the “0. 2 minutes. Refer to the user manual specific to your GlowWorm boiler model for detailed information on the controls and their Airlocked pipes - air gets trapped in the pipes and leads to blockages. Leaks can be very small and you may not be able to see them. Related Products. Install the two new burner seals. glow-worm. You can rely on our range of high-efficiency heat-only gas boilers. 47-019-09 High Efficiency Condensing Combination Boilers www. However, it is essential they also find and fix the leak. Regular servicing and cleaning can help prevent the accumulation of such deposits, ensuring the efficient operation of the Glow-Worm boiler. The printed circuit board monitors the air pressure switch to make Aug 14, 2015 · The pressure I'm looking at is what's on the digital read out on the boiler. Training; Literature; spareCHECK App; Club Energy; About Glow-worm. Turn the valve next to the key until water flows through it. Boiler Model Fault Codes Cause of Problem: Betacom: Red LED On: Lockout – low water pressure (increase pressure to 1. Ask a competent person to explain how the safety devices work and where they are located. Feb 19, 2024 · How to Repressurise a Glow-Worm Boiler. Discuss Glow-worm Betacom 24c High Boiler Pressure in the Plumbing Jobs | The Job-board area at PlumbersForums. A Glow-worm system boiler is ideal if you have high demand for hot water from multiple sources at once in your home, or you have limited space in your loft. Steps to reset a Glow-worm boiler: Locate the reset button on the boiler body. Once it has, shut off both valves one after the other. Easily mountable on a wall, the Glow-Worm Ultimate 35c is a space-saving device. Remove the front casing. Flexicom High Efficiency Condensing Boilers. The prices scale with output; a higher-capacity 35kW model will cost more. The boiler should then take several minutes to restart. You may question if it is worth it 5. C. If it does, then it's unlikely to do with your radiator circuit. Like fault codes F3, F2, and F1, the above fault codes mean the boiler has a faulty circuit. If the pressure drops after you repressurise the unit, call in a boiler engineer rather than trying again. Turn the minute hand (4) clockwise until the arrow (2) points to the current time on the 24-hour dial (3). The boiler features a modern, bright, LCD display with an easy-to-use interface, and is also compatible with Glow-worm’s popular MiGo app based control (sold separately). Copy link. Now it's 5PM it's getting colder so I tried to set How to top up the pressure on a Glowworm Ultimate 30c, My Glow worm energy 7 30c boiler says 3. Ensure that the power supply to the boiler is turned on. Slide the pin for the time interval, in which the heating mode should be switched on, outwards (6). The air pressure switch is a safety device which ensures the fan is working correctly. Here are some more guides for other Glow-worm problems: Glow-worm boiler pressure; Glow-worm boiler leaking; Glow-worm F22 fault; Glow-worm F28 fault; Glow-worm F29 fault ; Glow-worm F75 fault; Glow-worm F83 fault; Summary. Glow-worm has a wide range of solutions to Boiler Plus, from the top of the range smart control MiGo to the easy-to-use Climastat room thermostat for the very simplest way to comply. FGHR (Flue Gas Heat Recovery) - This process redirects gases that escape the flue back into the boiler to preheat the water. When your Glow-worm boiler is not working there are a few simple things you can check yourself without Jan 1, 2024 · Glow Worm F4; Glow Worm F28; Glow Worm F29; Glow Worm Fault Codes & DIY Fixes If Possible. No. It triggers mechanisms that ensure the pressure is safe by allowing or restricting the fluid flow. Once you have located the pressure gauge, make sure it is visible and easy to access. A Glow-worm regular boiler would be perfect for you if you have a busy household with more than one bathroom Leaks in the system will cause your boiler to lose pressure. The codes F1, F4, F28, and F29 will appear on your Glow-worm boiler if there is a pipe issue. 5 bar. Also known as heat-only, conventional, or open-vent boilers, this type of boiler will ensure that your hot water and central heating needs are met. Jan 9, 2024 · How to replace the water pressure sensor on a Glow-worm F75 fault: Isolate the electric supply to the boiler. User-friendly LCD display. *7 year guarantee available as standard. If the fault code persists, you may need to call a professional The Ultimate 35c boiler from Glow-Worm is a seriously proficient heating unit, and can adequately cater to large-sized homes. 4. Issues in the pipes can be tricky to identify and you shouldn’t touch the pipes yourself. Turn off your boiler and wait for the whole heating system to cool down. Instant hot water supply. Bright, LCD display with easy-to-use interface. With We have 4 Glow-worm 30hx manuals available for free PDF download: Installation And Servicing, Instructions For Use Manual Glow-worm 30hx Installation And Servicing (52 pages) Condensing Boilers Mar 18, 2014 · Mar 18, 2014. g. due to explosions. Dec 12, 2021 · 3. 6 Removing the gas-air mixture unit Note The gas-air mixture unit consists of three main components: – Fan – Gas valve, – Burner cover Switch off the product via the main switch. If you are having boiler issues due to glow worm boiler pressure, you are at the right place. 5) when heating is on … read more Rick Ridley 1. We offer a number of high Glow-worm regular boilers are specifically designed to be durable and easy to use. When you book your appointment, you’ll need to provide the boiler type and serial number of your appliance. I have been repairing boilers for over a decade and this is how to fix an F22 fault. Jul 8, 2020 · Turn the boiler off overnight. Sponsored Links. Glow-worm’s exceptional regular heat-only boilers (also known as ‘open-vent’ boilers) provide central heating and hot water via the boiler, a storage cylinder and a water tank. 2. co. Remove the casing from the boiler and pull down the panel. uk Supplied By www. Here, you are going to find out the best information about boiler Oct 31, 2023 · If the pressure gauge on your Glow-worm boiler reads anything below 1 bar, there may be a problem that will cause your central heating system to function poorly. Modern boilers are fitted with expansion vessels, a large tank that can contract and expand to keep the boiler pressure constant as temperatures change. Nov 30, 2023 · Glow-Worm Regular Boilers Service. 7K. Low pressure is a very common problem for most Glow Worm boilers and luckily is one of the easiest to fix fault codes. 0020238424_04 Betacom 4 Installation and maintenance instructions Wait for the water pressure to reach between 1 and 1. Mike83, Jul 8, 2020. If so, replace the flame detection probe and lead. 5 bars. Jul 3, 2023 · The Glow Worm boiler F9 fault is an indication of low water pressure within the system. Is your Glow Worm boiler displaying the F75 fault code? Here we explain the common causes and potential ways to fix. pressure falls below 0. Use a solvent-free soap to clean its casing. Combi boilers; System boilers; Heat only boilers; Controls and thermostats; Business support and tools. Close the gas isolator cock. expansion relief valve, expan-sion vessel) can lead to poten-tially fatal scalding and other in-juries, e. Here are some tips: For best results, enter your product model type followed by your issue (Example: “Ultracom 2 water pressure”) Mar 16, 2021 · How to top up your glowworm ultimate boiler pressure Jun 6, 2024 · Glow Worm Boiler Prices, Installation Costs & Reviews for 2024 Glow Worm is a boiler manufacturer with over 80 years of experience in the heating industry, and you’ll be glad to know that Glow Worm boiler prices are some of the most competitive in the UK Although slightly less popular than other more common brands, […] Step 1: Familiarise Yourself with the Controls. May 18, 2016 · The Fix: Check the pilot assembly is clean and free flowing from the gas valve. 1 bar per 12 hours but consistently and it's been turned off for a month now as it's summer. Open one valve fully ; Open the other valve slowly until you can hear the water; When the pressure has reached 1 to 1. To repressurise a Glow-worm boiler, you must open the two valves at either end of the boiler filling loop to let some water in. All you need to do is press the reset button and hold it for 3-5 seconds (boiler manuals typically state where a particular model’s reset button is, and how long it needs to be pressed down). uk Page 2 General and Sales enquiries Tel: 01773 824639 Fax: 01773 820569 Glow-worm is a licensed member of the Benchmark Scheme which aims to improve the standards of installation and Welcome to Ask Glow-worm, where you can get instant answers to a wide variety of questions you may have. Key features: Allows for weather compensation when paired with Climapro2 RF and Climapro1 RF. Glow-Worm’s regular boiler systems come in outputs up to 25 kW and work with cold water storage tanks, cylinders, and expansion vessels. Glow Worm boilers show the F9 fault code which indicates that the boiler is experiencing low pressure. Verify that the boiler pressure is within the recommended range. xofmblcwcbjkpnpglrau