Yesterday i went for a shower and the water would not heat up, and it fails to do so in the kitchen now. However the boiler is heating the flat/radiators perfectly well, just not my water. Does any one have any idea of what is wrong and how to fix it?I would call an engineer but i want to have an idea of what is going on.Thanks to all that answer, as ever!
is piolit lit but call engineer they will figure it out
Sounds like the domestic hot water sensor in the boiler is faulty, these cost about ?26 to buy, but must be fitted by a qualified engineer,(By Law). The D.H.W.S. senses the flow of water through the boiler and switches the boiler over to heat the water instead of the radiators.
First of all you must establish is your system a combi or system boiler. For system boilers ensure the air vent near the hot water tank has been bled of air, if that's OK I would suspect the diverter valve which is usually fitted next to the hot tank. Try this by moving the lever on the valve across until it locks in position, now fire up the boiler and wait to see if you get hot water in the tap. If yes, then its the motor in the didiverter valve, you can buy a new valve ?70 or a new motor ?20. If the boiler is a combi, again it is probably the diverter valve in the boiler, but first check the water pressure shown on the gauge, top it up to around 2 bar, the red line. Try the boiler, if no luck call a plumber as combi boilers are very cramped to work in.
There is a problem with the flow-switch on your boiler. It's supposed to sense the flow of water when you turn the tap on switch the boiler on to heat the water as it passes through. Flow-switches come in different forms depending on the model of your boiler, but my bet is that you have a rubber diaphragm type, which is part of the Diverter valve. If the diaphragm becomes stretched or split, the onrushing water does not push it make the microswitch to switch the boiler from central heating to hot water mode. Usually it is possible for the engineer to replace just the rubber diaphragm instead of the whole diverter valve, which is much more expensive.
