When you buy through links on our site, we may earn an affiliate commission. Recommended reading: No Hot Water from Boiler: Our Ultimate Troubleshooting Guide Luckily, the diagnosis is easy: there’s an issue with your By using this form you agree with the storage and handling of your data by this website. If you’ve noticed a whole host of other problems alongside a gas valve related fault code being shown, the PCB could be the culprit. As the source of central heating and hot water, a functional boiler is essential to any British home – particularly during the colder months. 6. But, when your boiler locks out due to a gas valve fault, the idea is to make your boiler safe; continued operation could mean gas is being leaked into the burner. If your gas valve has only recently started having issues with the sticking (in any position), there’s a good chance it can be salvaged. No heat or hot water. Confused about new boilers and their costs? So, always speak to a Gas Safe heating engineer, and don’t attempt to fix your boiler on a DIY basis. Gas off external to boiler. 2 October at 4:19PM in In my home (includes DIY) MoneySaving. If it’s a case of simply freeing the valve due to it being stuck open/a closure fault; this could be less than £100. Do not disconnect the wiring from the gas valve and attempt to measure voltage at that point. ; Temperature pressure relief valve … All electrical components on a boiler send and receive signals to the PCB. We use cookies to ensure that we give you the best experience on our website. 2. Your boiler repair company will be able to take apart the valve and hopefully, they can free it to a point where it operates smoothly again. When the valve gets stuck or seized it will either: When this happens, your boiler will show a fault code. Top 5 Basic Industrial Boiler Problems & Their Solutions | … Not all boiler gas valve problems are a simple fix. As you do, it asks the gas valve to adjust to provide the correct level of gas. installing a new boiler with a long warranty, rarely find that the repair costs are justified. The first thing your boiler repair company will want to do, is run a quick visual inspection. Your email address will not be published. If you can smell gas, it’s wise to turn off your gas at the mains. Replace the wiring if necessary. » 1. If the fan isn’t operational, the air pressure switch feeds back this information to the PCB, and the boiler will lock out. 3. Check any gas valves in the line. Gas valves last for years, so once a replacement is fitted, it’s likely to outlast the boiler, unlike a repair on an excessively worn part. Boiler Replacement Promise: If it's under 7 years old and we can’t repair it, we’ll replace it. In turn, that’s going to result in intermittent operation of the valve, fault codes being displayed, and the boiler locking out. A boiler is a bit more complex than a forced air furnace in that it has more parts, valves, and controls. If this is the case, you might see a range of fault codes being displayed. Water hammer with a steam boiler occurs when cool water meets hot steam. It’s too risky to repair a valve that is showing signs of excessive wear. One of the biggest problems with steam boilers that is the cause of complaints is water hammer in the pipes. Main burner remains alight when … In this 3-minute guide to boiler gas valves we’ll quickly explain how these valves work, common problems, as well as the potential replacement and repair costs. Pilot partially blocked or needs adjusting. Boiler thermostat set too low. Sometimes when people go on vacation or leave their home for an extended period of time, they’ll close their gas control valve for … However, your boiler should lock out and display a fault code when it notices a problem. What, what could be wrong with your gas valve? The boiler gas valve problems and faults, here we have Q & A or require an engineer for an emergency boiler repair. Not all boiler gas valve problems are a simple fix. Thanks for reading our 3-minute guide to boiler gas valves. For instance, the Vaillant F62, Worcester 234 or Baxi 133. If there isn’t any gas making its way to your boiler, your system won’t have the fuel necessary to heat your home’s water. Before completely writing off the gas valve, a Gas Safe engineer will be able to check the wiring, connections and operation of the valve. If you are experiencing an issue with your boiler, this guide to common boiler problems may help you diagnose the issue before reaching for the Yellow Pages and calling in … If someone has previously tried to fix a gas valve fault, it’s likely they may have tried to change the adjustment on the valve. The gas water heater thermostat is part of the gas valve. Find out more about high pressure in our boiler pressure article. When you demand heat or hot water, the boiler works like this: The most common boiler gas valve problem is one that’s stuck or seized. A faulty Vaillant F28 / F29 Boiler fault. The PCB is the heart of your boiler. While we always recommend calling a trained engineer to help with boiler problems, many technicians charge by the hour. No electrical supply to burner. 7. If you do need a replacement, you should expect to pay somewhere in the region of £300, including parts and labour. Lochinvar boiler troubleshooting | All . So, the cost of parts is going to have a direct impact on the cost of the overall valve replacement. In addition, there is no practical way to test it. And, make sure it’s a company that specialises in repairs. As boilers vibrate, they can work wiring and connections loose. Likewise, many gas valves are generic. Not only this, it’s likely that even if freed, the problem (sticking, as a minimum), is going to happen again soon. Proceed cautiously with the diagnostic steps you take. Take a look through the most common Ideal problems and how to fix them. So, if your emergency boiler company isn’t sure that the problem is fixed, it’s likely they’re going to suggest that you replace the valve. EPHG LIMITED © 2016 to 2020 © All Rights Reserved. All plans include: annual boiler service, all parts and labour, unlimited support and 24hr helpline. Boiler Troubleshooting Problems for Hydronic Heating Systems - Steam Boiler Problems. When electrical faults are present, the PCB can’t be ruled out as the culprit. 5. If it is, they’ll be able to assign the correct level of adjustment and reset your boiler to clear any fault codes being displayed, so your boiler is fully functional once more. That’s going to be the case if wiring and connections are damaged, leading to lack of power, as well as the valve sticking. If the gas valve and 2 or more of these other parts are in poor condition and your boiler is out of warranty, it’s likely a boiler replacement is the most cost-effective solution, not a repair. The closure fault mentioned above, could be due to an electronic issue, but it also could be to do with the gas valve sticking. Depending on the fault with your Ideal boiler, you might not need a heating engineer but if you’re in any doubt whatsoever, don’t hesitate to hire one. Is my boiler dangerous if there is a fault with the gas valve? While they are more reliable than gas boilers, they are not always perfect so from time to time electric boiler users can find themselves with no hot water. You may experience a lack of heat or hot water due to The Vaillant boiler is regard as in the top 3 by many engineers and prefered by others, however like many other boilers that can still have their If your unit isn't producing any hot water, it could be a number of things. ... sensor has noticed that the flame is not correct. We know this sounds like an unlikely situation, but it happens! No hot water from your Potterton boiler is not necessarily caused by a faulty diverter With Boiler Guide you can get free boiler repair quotes from engineers near you. Call a boiler repair company and turn off your appliance. 21 replies 403 views Livinlovinlaughin Forumite. If this wasn’t the problem, and they failed to put the valve adjustment back to its original setting, this is what could be causing the fault. If they find any section of wiring damaged, connections loose, or faulty components, they’re going to need to be replaced for the gas valve for be operational. Another frequent problem with gas valves, is them not closing properly. On some occasions, a reset might allow the boiler to operate for a few minutes, before the printed circuit board (PCB) recognises the fault is still present and locks out the boiler again. The parts they should be checking include: If the gas valve and 2 or more of these other parts are in poor condition and your boiler is out of warranty, it’s likely a boiler replacement is the most cost-effective solution, not a repair. However, we rarely find that the repair costs are justified, considering the unit is already showing signs of wear. It’s the fan in your boiler that helps to push dangerous gases out of the flue. A stuck valve could release gas into the air without regulation or the valve could cause the unit not to fire up at all. This reacts to you changing your thermostat and turning on taps. If these connections are loose or damaged, that’s going to result in intermittent signals being sent to the gas valve. Gas valves can be found on gas furnaces, gas fired steam boilers or hot water boilers, and gas … Pilot established - main burner does not light. In this article, we’ll cover the most common problems with gas valves, any available fixes, and what you should expect to pay in terms of repair costs. How much does it cost to replace the gas valve. And once you turn heating or hot water off, it asks the gas valve to close. On the flip-side, if you must go with an OEM valve from the likes of Worcester Bosch, the valve alone could cost in excess of £150. The mains gas lever is usually located next to your gas meter (it’s most likely yellow). When the need for gas in the burner increases, a communication is sent from the PCB to the gas valve, which opens and allows gas to flow through the valve in to the pilot assembly or the burner dependant on the model of the appliance installed. Faulty gas control valve. This Weil McLain boiler troubleshooting guide explores common problems and steps you can take to identify and possibly solve them.. Keep in mind the risks associated with boilers – severe burns, gas explosion and the risk of shock. However, if the valve is showing signs of excessive wear, it makes more sense to replace it, as a safety precaution. If a visual inspection doesn’t help pin-point the problem, your boiler repair engineer will need to inspect each section of wiring, and each individual connection. Considering this, if you are able to diagnose the issue and take a few preliminary steps before you book a repair, you could save the engineers time and … If the gas valve is the only component causing issues, it’s likely a £300 replacement valve (or, a cheaper repair), is the most financially viable option. For more boiler problems please click here. If your boiler repair company suspects a fault, they should always test other aspects of the boiler as well. Replace if necessary. Expensive parts besides the gas valve include the: The cost to repair the gas valve on your boiler will depend on what’s wrong with it. They don’t just stick partially open (letting-by), they can get stuck in any position (fully closed/open). When there’s a problem, this supply can be interrupted, causing faults that relate to a lack of flame, loss of flame, or flame instability. If by calling an emergency engineer to come out and fix your boiler immediately, you may find if you require a gas valve, you should expect then to carry one unless they are full aware of the make and model and that you require a gas valve already as every company may have different terms. Ask your boiler engineer to inspect other expensive parts and asses their condition, before deciding. If the leak stems from your pressure relief valve, it is likely that your system’s pressure has become too high. Gas Valve Thermostats. Without a fully functional gas valve, you won’t have a fully functional boiler either. The valve needs to be tested after the boiler is reset. If there’s a closure fault with your valve, that’s going to mean that it’s “letting-by”. 7. Understanding the components of a hot water boiler can help with basic troubleshooting. An engineer will check the wiring and connections to and from the PCB using a multi-meter. All being well, your gas valve should adjust to suit hot water and heating demand. It’s most likely that the valve is sticking and can be freed. It’s the PCB that controls the gas valve (as well as other electronic components in your boiler). Although there are many scenarios where the gas valve on your boiler can be fixed, that’s not always going to be the case. Common Boiler Problems: Causes and Quick Fixes . Whilst the valve was at fault, the PCB was too. Resetting your boiler should only be done when the problem has been found and fixed. Speak to your engineer and see if there’s a non-OEM (but high quality) gas valve, like Honeywell, that’s compatible with your boiler. The Fix. In this scenario, it’s likely the valve is beyond repair. And, we say £300, because the cost of parts for different boilers, varies a great deal. No Hot Water. HeatingForce is reader-supported. In some cases, a Gas Safe engineer will be able to free the valve. If 2-3 expensive parts in a boiler are worn, it makes sense to invest that cash into a new boiler, not an old one. However, they’ll need to rule out wiring, connections and the PCB. If you require an emergency call out for your boiler repair, the cost can vary depending on the time you require an engineer to visit and the company your using in question. The PCB first detects the fan is operational, ready to expel dangerous flue gases via the flue, The gas valve opens to allow fuel to the burner and pilot light, The flow of gas continues until the PCB recognises that the NTC thermistor (flow sensor) has reached the desired temperature, Not open, and therefore not supply gas to the burner and pilot light, Not close, and gas will be letting by even if you’ve turned heating and hot water off. Like any mechanical component, over time they will wear. It’s controlled by an electrical signal coming from the printed circuit board (PCB). Here is a list of the most common boiler issues, what causes them, and what can be … As your engineer will already be testing the boiler’s gas valve with a multi-meter, it makes sense to test the PCB too. Use Figure 9.1 to troubleshoot intermittent ignition gas valve. The gas valve is a instrument used for gas distribution. A much better option would be to get your boiler repair company to replace the valve. Without it, your boiler won’t work. If it’s fully operational, a replacement won’t be needed. 8. And, if you’ve got any questions about gas valves, leave a comment below. The problem here, is the gas valve might still be stuck open. Improper … When water changes to steam, it expands 1600 … As we’ve already mentioned, not all boiler faults are what they seem. The thermostat cannot be replaced independently from the gas valve. Across many online forums, you’ll see various horror stories, where homeowners have replaced the gas valve, and even the PCB, only to find that the problem hasn’t been fixed. You see, during normal operation, when a gas boiler receives the call for heat, the gas valve opens and releases a small amount of gas into a sealed combustion chamber via small “jets”. If this section of wiring is even slightly damaged, the signals are going to be illegible for both components. Faulty gas control valve. As a final note, you should always consult your boiler engineer before replacing parts, or your boiler. And, due to the cost of a PCB replacement (upwards of £450), combined with a gas valve fix or replacement, you’ll need to think carefully as to whether a replacement boiler might be the better option. Troubleshooting the valve and looking for known common issues will give you peace of mind by ensuring the safe operation of your … The gas valve … 6. Refer to our guide to boiler fault finding. Because gas is involved, problems with gas valves are a major safety concern. You might have noticed the LED lights on the display panel flashing, the boiler cutting out before getting up to temperature, and hot water working when the heating doesn’t (and vice-versa). This creates weak (or incorrect) signals and the PCB may think the gas valve is off (and vice-versa), even when it isn’t. We’ve been to properties where the engineer has jumped to conclusions and replaced the gas valve. Start boiler using Lighting/Operating Instructions. Without a properly working valve, dangerous levels of temperature and/or pressure may build up in a home’s heating system. If you believe there’s a risk of injury, leave the … If you work on a boiler without this accreditation, it’s not just dangerous, in many cases, it’s illegal. Even when there’s a small possibility of a repair, it’s unlikely your boiler engineer is going to take the risk, especially when this part is one that can essentially, end up in a boiler letting-by gas. Many of the problems you encounter with gas boilers, you will not encounter with an electric one. It makes little sense to spend money on labour, only to have a repair company back to then replace the valve. 1. 5. If all else fails, it’s likely the valve is faulty, or beyond repair. If your boiler is 5 years or older (especially if it’s a lower quality brand), it’s likely the gas valve is beyond repair. And, as they start to wear, they become prone to sticking. The focus is the wiring harness between the gas valve and the main PCB. You’ll need to get a Gas Safe boiler repair company to come and assess the situation with the valve. 8. Your email address will not be published. There’s a good chance a connection is loose. However, that’s not possible if it’s been incorrectly adjusted. Gas off at boiler gas valve. A specialist boiler repair company will be able to test the valve and monitor it after every adjustment to make sure that this is the problem. Help please! For instance, a gas valve (parts only) for a Vaillant EcoTec 28, will cost around £170. If you continue to use this site we will assume that you are happy with it. Worcester boilers installed from as little as £1,649? The gas valve on your boiler will open and close, attempting to provide the burner with the correct level of gas. On the flip side, gas valves for Glow-Worm boilers can be as cheap as £100. However, we must stress that the majority of boiler problems require the expertise of a Gas Safe registered engineer. However, whereby a replacement valve can be purchased from the likes of Honeywell, this price can be reduced (they sell some valves for under £90). If your boiler is 5 years or older (especially if it’s a lower quality brand), it’s likely the gas valve is beyond repair. Before any of this happens, your boiler’s PCB wants to see a signal that the fan is operational. Save £1000+ on a brand new Worcester Bosch, or Viessmann boiler. In most scenarios, the gas valve can be freed and refitted. Before completely writing off the gas valve, a Gas Safe engineer will be able to check the wiring, connections and operation of the valve. However, this is a key component that can lead to gas letting-by (in the case of a closure fault). Boiler repair costs will vary greatly based on the problem and rates charged by the installer. 9. You can save money by resolving certain boiler problems yourself. Due to the cost of labour, the cost of a repair in this case isn’t a financially viable option. The PCB then needed to be replaced at an additional cost. 4. The heating doesn't matter thankfully but I have no hot water. However, if your boiler is old, out of warranty, and has problems with other parts, it’s likely a replacement is the most financially viable option. That means it’s going to stick open (providing high levels of gas supply, even when it’s not needed), or completely closed (providing no gas supply, when it is needed). Faulty thermostat or connections. Should the leak be due to a problem with the pump seal, the seal could have worn out. There are repair and reconditioning kits available for boiler gas valves. Plugged orifice spuds. In some circumstances, there’s a chance that the pre-set adjustment of the valve that’s come from the manufacturer, isn’t what it should be for the boiler it’s been fitted too. Whilst the meter regulates the flow of gas into the mains and to the boiler, it’s the gas valve that controls the flow of gas into the burner and pilot jet. Get your fixed price in 60 seconds (from WarmZilla) and installation as quick as tomorrow! 6. Step 4: No hot water in electric boilers. Most boilers have a basic fault code system. Without these signals, they don’t know what to do next, and the PCB doesn’t know what they’re doing currently. For some faults, the boiler locks out to protect important boiler components from damage (for instance, lack of water, causing the pump to work harder than it should). Always ensure your engineer inspects all the most expensive parts of the boiler, before replacing the valve. This fault is less commonly seen and if you are seeing either of these fault codes there will probably be one clear issue: you won’t have any hot water or heating supplies. If your gas valve has already had issues with sticking, the next stage of wear, is a complete seizure. Essentially, that means gas is leaking into your boiler’s burner, when it shouldn’t be. 5. Required fields are marked *. The SE Water meter man has been back to look at it and said it is nothing to do with the meter. On/off switch is in 'OFF' position. Got other boiler problems not mentioned above? Defective gas valve. A typical gas valve replacement price will be around £300 including parts and installation. Extreme pressure within the system could cause the boiler or water lines to rupture. Gas valves are mechanical components and do wear over time. And for this reason, you shouldn’t attempt to reset your boiler. The main control board can detect if the gas valve is not connected and will display the Gas Valve or Gas Valve Fail fault. They’ll be able to test both, using a multi-meter. Any fault code that relates to an electrical part (such as the gas valve) might not be as accurate as you think. Get a new Worcester Bosch or Viessmann boiler fitted as early as tomorrow, HEATABLE: Rated 4.92/5 stars on Reviews.co.uk. If any of these are unsecure or faulty, they could be providing the wrong signals to the gas valve. Once your emergency boiler repair company arrives, they’ll check over the gas valve. Learn more. Whilst it might seem like the gas valve is incorrectly adjusted, not responding, or letting-by, this might be due to the signals it’s being given by the PCB. Although the gas valve may also be at fault, the PCB needs to be fixed too. For more boiler problems please click here . You can replace the gas valve, although, unless your water heater is not working at all this should not be needed. 7. That heat exchanger then is used to heat water. As you can imagine, a gas valve that’s leaking gas into your boiler isn’t safe at all. The pressure relief valve, also as known as a blow-off valve, is a vital component of a boiler. Call a Gas Safe engineer and leave the fixing and resetting of your boiler, to them. After all, it’s the PCB that controls these components and displays the fault code in the first place. A boiler engineer will be able to run checks to see if a faulty diverter valve is the cause of the problems, or if there is another underlying issue. Other types of gas valves include the standing pilot gas valve. Like the gas valve, the PCB can be tested using a multi-meter. Check, clean and re-install. Components of a Hot Water Boiler . That gas is then ignited by the pilot light and the jet flames heat up a “heat exchanger”. As we mentioned above, wiring and connections can have a huge bearing on how your gas valve behaves. The most common boiler problems are low boiler pressure, leaks, a blocked condensate pipe, faulty valves and pumps, and internal limescale & debris. Once these loose connections are secured, the signals will return to normal after a boiler reset. Any boiler fault is potentially dangerous, especially any problem that relates to gas. Instead of occasionally causing issues, restricting the flow of gas, or providing too much, it’s going to stick or seize completely. It is likely that the valve has simply become stuck over time and needs to be cleaned using a commercial chemical cleaner, after which it can be refitted. If you find a leak, you’ll probably need to contact a Gas Safe Registered engineer.Here are the main reasons for a boiler leak: Pressure relief valve – if your boiler pressure is too high, the pressure valve will pass water as a safety precaution. Boiler gas valve replacement costs are usually determined by the cost of the valve itself. However, A boiler leak is usually caused by an issue with an internal component, such as a pressure valve or pump seal. Gas Valve Troubleshooting - Gas valves used in a modern state of the art residential gas furnaces are typically controlled via a state of the art electronic ignition control or a printed circuit board. If there’s a problem with communication or power with the PCB, this could be the root cause of the problem. The lock out function in modern boilers is designed with two things in mind. After having a water meter fitted last week, my Ideal Logic + Combi 30 boiler has stopped working. However, the time taken and the cost of these kits usually means replacing the valve is a better option. Gas Boiler problems? The gas valve on your boiler controls the flow of gas to the pilot light and burner. They could to relate to the gas valve being stuck, letting-by, or more frequently, something along the lines of “flame detection, even when there’s no demand for gas”. Boilers are gas appliances and should be worked on by Gas Safe registered boiler repair companies. 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