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Sorry pump drive pcb. The boiler was not working properly. The radiators were on regardless of the setting on the thermostat or on the timer on the boiler.

Problem solved. Managed to get a new pump drive off ebay for £34, fitted and a working boiler again! Thanks for your replies..Dave.

After testing the thermostat it is not this which is the fault. Would the problem be the thermostat even though when the mechanical timer on the boiler is set to off the radiators are still on? Thanks Dave.

Hi yes the system was working properly up until a week ago even with the buzzing that was coming from the delay timer pcb. The thermostat is a Drayton RTS1 and the heating is on no matter what setting it is on even in the off position. If the mechanical timer is set to on then you can still hear...

No the only PCB I have replaced is the pump delay timer as this was the one that was buzzing. My only thought now is that it may be the pump drive pcb but like I said I cant afford to throw money at it just to try each time! Thanks Dave.

Well the PCB had the buzzing so could have done to be replaced and the mechanical timer was the only other thing I thought it could have been. So I am lost other than the pump PCB but I cant keep spending money on it just to try. Please help!

Well after replacing both the delay timer PCB and the Grasslin mechanical timer (like for like tactic 111.2) I still have the problem of the heating permanently being on. Please can anyone shed any light on this as it is really annoying me now! Thanks Dave.

Yes it is a grasslin timer. Thanks for the quick reply what is the best way to test the timer please? Not an expert in this field! Thanks.

I have a Boilermate II and the heating is permenantly on full regardless of the setting on the mechanical timer (on, off or timed with no settings activated) and the setting on the thermostat. The pump PCB has had the common buzzing noise for the last 6 weeks but the performance of the boiler...