Our showers suddenly run cold, hot taps take a long time to get got water — not all the time but it is getting worse just like last time. What is the advice? Spend money on the exchanger or other remedies or is it time for a boiler change? I get about mins of hot water in the shower before it starts to fluctuate running cool then warm never gets as hot as the first 5 mins and the warmer periods are too cool for a shower.
Occasionally, we only get about 1 min of hot water before the fluctations start. It is inconsistent. I have the hot water set to 5 out of 6 on the front of the boiler, and the hot water runs about 73 degrees out of the tap and then reduces to about 40 degrees after about mins. Any thoughts? It sounds like it could be diverter valve based on your explanation above.
We have had the heat exchange replaced a fortnight ago. Your email address will not be published. By using this form you agree with the storage and handling of your data by this website. Get a new Worcester Bosch or Viessmann boiler fitted as early as tomorrow. Boiler Broken Down? Table of Contents What is a diverter valve? What kind of fuel does your boiler use? Grab your fixed price online by 3PM, and get next-day boiler installation. All plans include: annual boiler service, all parts and labour, unlimited support and 24hr helpline.
Occasionally F22, appears which does not allow Hot water or Central Heating together. Independently Hot water or Central Heating work satisfactorily without any problem. When it does get stuck, it might be left slightly open on the heating side, which means hot water that should normally go to the taps and showers is otherwise lost. When this happens, consider how your annual energy bills may be affected.
The more heat that gets lost, the more money is wasted. The diverter valve itself will probably be stuck on the side that supplies hot water. It will only be able to send the water through to central heating. Try seeing what happens when you turn your central heating on as well. For your domestic hot water supply, it can cause a build up of limescale. For the water going through your central heating system this causes a build up of magnetic sludge.
This makes your radiator cold at the bottom, which requires a chemical flush or similar process to clear out. If your boiler is reaching a decade old, a faulty diverter valve might not be the only problem. The first thing you should do is to seek professional advice on how to solve the problem. Whether this is done through an installer like Boilerhut or an independent contractor, they can provide more detailed answers that you need.
If someone unqualified tries this, it can have serious repercussions. Not only is it against the law, but it may affect the warranty and home insurance as well. Call Boilerhut on where we can discuss exactly what the best option is for you. You can also get a free, no-obligation quote by filling in your postcode below. Avoid buying a cheap product and instead make sure your old boiler uses components that are built to last. If you have no hot water , try turning the heating on.
Wait a few minutes and try the hot water tap again. If hot water starts coming through, there may be an issue with the diverter valve. You may have the opposite problem, whereby your hot water is coming through but your radiators are cold when your thermostat is set to a warmer temperature. This could also indicate that the diverter valve is stuck because your boiler is allowing water through to your taps but blocking off the water to the rest of your heating system.
If your hot water tap is only releasing lukewarm water, you may have a stuck valve. The valve is allowing some hot water through but not enough to make the water hot instead of warm. This is one of the most common signs that your diverter valve is faulty. However, in most cases, the valve may have become stuck and simply needs to be cleaned and re-fitted.
The engineer might choose to replace the whole diverter unit to prevent the new valve from sticking. You could also ask the engineer to look at other parts of your boiler while the casing is off. They could check over any other parts for wear and tear.
If your boiler is still under warranty, the valve may be replaced at no cost to you, provided you use a manufacturer-approved service technician. If you have a boiler cover policy, this may offset the cost. It might not be worth getting the valve replaced if your boiler is older than 10 years. Welcome to Viessmann United Kingdom! It looks like you might not be in the UK? Instead of attempting to fix the diverter valve yourself, we recommend that you call a qualified heating engineer to come take a look at it for you.
Any work carried out on a gas appliance is dangerous and can damage the boiler further if not handled carefully.
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. 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. The engineer may also advise you to replace the valve depending on the severity of the problem. We recommend checking to see if your boiler is under warranty.
If it is, you may be able to replace your diverter unit free of charge. In some cases it may be more economical long-term to replace the entire boiler system, which can be the case for combi boilers over 10 years old. Your heating engineer will be able to advise you on this following their checks on your system. Back to Blog.
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