OK so I received and fitted the CAN wires that Martin sent and connected it back up to the FBH. Start diagnostics and connects OK with FBH and get live reading of supply voltage, temperature and flame detector. Click Park Heating....and nothing...no fans, no firing, nothing.... .
Ironically the FBH is behaving better than ever and no faults for some time, so the pressing need to use diagnostics has gone, but I would like to get this sorted as ultimately I suspect it has not permanently cured the problem.
I did notice that the temperature was high, about 45 degrees, since the FBH had fired on timer that morning. Did anyone confirm whether the CAN disables FBH burn once over a certain temperature? I'll try it at the weekend from cold to eliminate that as a source. I'll also double check the wiring.
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