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3 year old boiler with intermittent problems. Posted query on here about a week ago under similar subject on 23rd Jan 05. Anyway it started working fine for a couple of days when lunch time today the RCD on the electrical fuse box tripped, after a process of elimination its the boiler! After...

the multimeter that i have checks to make sure that a circuit can be completed - it beeps when a circuit is made. Each wire was disconected and the multimeter electrodes placed one at each end of the wire - it showed that there was a circuit and no short. I have tried lowering the control...

2 yellow thermistor wires fine 2 orange wires fine 2 white wires fine However, tested the eloctrode lead and found that the multimeter couldnt complete the circuit. Are there any metal wires in this lead or is it some form of synthetic conducting material. Odd thing is that once boiler...

yes the plumber is corgi registered, should he have known about the testing etc?

where can I get a fault chart from? what do tyou check for - the resistance?

yes sometimes the red light stays on which I beleive means that its working ok. However, every now and again it flashes and it needs to be reset to work again. when you mean tester, do you mean a multi meter?

My gut feeling is that it is the gas valve but it is so intermittent. I am fairly handy with tools - do you think that I would be able to change the pcb myself?

Three and a half year old boiler which tends to turn itself off for no reason and requires frequent resetting. A typical day - I have to reset the boiler each night before going to bed and after the timer has switched the system off - 11pm. 6am and the timer switches the system on, red light...