My Ideal Isar HE35 has stopped firing up when a hot water tap is turned on.
The boiler fires up and sends hot water to the radiators if I push the thermostat up high enough for it to kick in, so I know the boiler works., but only for CH.
I thought it might be the diverter valve, but this seems to be moving between CH and DHW fine.
My guess is the problem is something to do with the electronics not telling the boiler there is a hot water demand and so the boiler doesn't fire up.
Just to add that the boiler indicates only a "0" when switched on, and correctly shows a "c" and the ignition light is on when the CH kicks in. I have turned on and off, pressed the reset button but still everything is the same. As we had no need for the CH over the last couple of months the water pressure had dropped below 0.5, and there seems to be some air in the heating system but surely this shouldn't affect the hot water coming on, or does it?
Any help would be really very much appreciated. Many thanks.
PS The boiler was serviced in April 2013 by someone who seemed to know their way around the model and wasn't as critical of the boiler as my previous service engineers had been! Also the PCB was replaced about 3 years ago, hope it isn't that again...
The boiler fires up and sends hot water to the radiators if I push the thermostat up high enough for it to kick in, so I know the boiler works., but only for CH.
I thought it might be the diverter valve, but this seems to be moving between CH and DHW fine.
My guess is the problem is something to do with the electronics not telling the boiler there is a hot water demand and so the boiler doesn't fire up.
Just to add that the boiler indicates only a "0" when switched on, and correctly shows a "c" and the ignition light is on when the CH kicks in. I have turned on and off, pressed the reset button but still everything is the same. As we had no need for the CH over the last couple of months the water pressure had dropped below 0.5, and there seems to be some air in the heating system but surely this shouldn't affect the hot water coming on, or does it?
Any help would be really very much appreciated. Many thanks.
PS The boiler was serviced in April 2013 by someone who seemed to know their way around the model and wasn't as critical of the boiler as my previous service engineers had been! Also the PCB was replaced about 3 years ago, hope it isn't that again...