Hi ~ need some advice or direction. My 5 year old Glow worm Mircron 60 FF boiler is playing up.
When the CH is on and the room thermostat is up to max the water is being pumped around the system, but the boiler is not firing up.
When the HW is on the boiler keeps firing up in approx the same sequence 20 secs on 10 sec off.
When both CH & HW on as per HW only
Ideas, replaced PCB board 12 months ago because it had burnt out, and had a new one fitted yesterday as we had similar problems to when the first one died.
When the CH is on and the room thermostat is up to max the water is being pumped around the system, but the boiler is not firing up.
When the HW is on the boiler keeps firing up in approx the same sequence 20 secs on 10 sec off.
When both CH & HW on as per HW only
Ideas, replaced PCB board 12 months ago because it had burnt out, and had a new one fitted yesterday as we had similar problems to when the first one died.