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Hi, thanks for all the advice. I'll give it a try and hopefully get back to you with good news.

Hi Gasmick2 Yeah I had a feeling you thought it was a combi, no worries. I have tried the things you suggested, but no joy. I was thinking of just replacing the APS and overheat stat, caus' everything else seems to work ok independently. I was hoping for a cheaper solution but can't see one.

Hi, thanks for the reply, I'll try that.

Still not sorted, and open to reasonable suggestions.

Hi, where is low pressure switch? it doesn't seem to have one.

Thanks, I'll try that

New thermostat fitted and still nothing. Anyone any ideas. Getting desparate!!

Hi I'll try that. Have ordered one. I'll get back to you with the result. If you have any other ideas gives a shout. Thanks

Hi is that the control thermostat switch, the one with the white knob?

Hi, Yes the PCB is a honeywell.

Hi, Yes I have but it doesn't make any difference. Could it be the PCB again? Thanks

My 3 year old Ravenheat CSI Primary Condensing Boiler won't fire up. The fan, pump etc have all been tested and all seems o.k. (although there doesn't seem to be any power at the fan) The red power light comes on and the room stats etc are calling for heat, but nothing happens. I had a new fan...

Hi Mick Thanks for the response. It's a Ravenheat CSI Primary Condensing Boiler, (not Combi), it doesn't have a guage. I have checked all the main parts and they all work individually. Would running the pump from a separate supply cause any damage?

My 3 year old Ravenheat boiler won't fire up. The fan, pump etc have all been tested and all seems o.k. If I wire the pump to a separate supply the boiler fires up and works as normal. I think there's possibly a fault in the control thermostat switch. Anyone any ideas before I buy one or...

My boiler won't fire up. I have tested everything, fan, pump etc and all seems o.k. I wired the pump to a separate supply and the boiler fires up and appears to work fine. I think there's possibly a fault in the control thermostat switch. Anyone any ideas before I buy one?