I have a combi boiler and have just installed a new shower. The mixer says it is OK for combi boilers but when I use the shower it runs hot and cold. My water pressure is good. No other appliances or taps were being used while showering.
Does the boiler fire when you turn on shower and does it keep cutting out and restarting- if so could be boiler thermostat cutting out due to faulty stat or scale in heat exchanger or it could possibly faulty thermostatic mixerPEDANTICVINDICTIVEMAN said:Try running the hot tap on the basin and then turn on the shower valve to approx temp position you would normally use it at, then leave it a while to stabilise and see if it solves the problem, a different shower head letting the right amount of water pass throught the boiler may sort the problem, it has on mine.
Of course if your combi is an old one and doesn't modulate, you could be up shiiitte creek without a paddle.
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