I know there has been simular topics to this one and it seems the senses of opinion is the problem is the heat exchanger but when I mention this to my gas engineer he says he doesn't think so (but doesn't know what the problem is!!)
My Problem........
It is an intermitent fault that makes it all the harder to diagnose. It effects the central heating and hot water but sometimes if I flick between the two I can get it working again (but sometimes not!!).The boiler wont ignite and the burner light doesn't come on but the boiler makes all the usual noises as if its running. The burner light occasionally comes on for a few seconds and then goes out again. The pressure is fine (about 1.5bar) and doesn't drop. The boiler engineer hasn't mentioned that there is any water leakages. He has cleaned the fan and replaced the PCB and the ignition electrodes. - I still have the same problem and the engineer doesn't know what it could be.
HELP
My Problem........
It is an intermitent fault that makes it all the harder to diagnose. It effects the central heating and hot water but sometimes if I flick between the two I can get it working again (but sometimes not!!).The boiler wont ignite and the burner light doesn't come on but the boiler makes all the usual noises as if its running. The burner light occasionally comes on for a few seconds and then goes out again. The pressure is fine (about 1.5bar) and doesn't drop. The boiler engineer hasn't mentioned that there is any water leakages. He has cleaned the fan and replaced the PCB and the ignition electrodes. - I still have the same problem and the engineer doesn't know what it could be.
HELP