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Control board is quite heavy and can with rough handling snap plastic mountings that secure it via screws to the folding front panel. Check the screws are securely holding the board to the front panel otherwise weight of control board could be being part supported by wiring (causing wires to be...

Decided to read MI and followed fault-finding flowchart for CH controls. found v.low voltage at modulator coil terminals (replicated at control terminals) and no fault with wiring and connections, so flowchart suggested replacement of modulator coil. Replacement of modulator coil as described...

Thanks for replies. I've checked CH control knob and it is moving the pot spindle ok, also quick check of in-circuit pot value shows a varying resistance similar to HW pot so I assume also ok. I've noticed that when on CH and demand for HW comes the "problem with fan/flue" LED comes on...

Hi, With the temperature control knob set at a position 1/3 round the dial, the CH temperature control on my boiler races up to 80degc and the boiler makes no attempt to control at what should be about 60degc for this setting. Adjusting the temperature control knob down to zero position has...