The boiler runs for a while without fault before cutting out and not restarting for some time. Sometimes this might be a couple of hours.
It gets to the stage where the fan should run, and it doesn't!
I've tried to run through the fault-finding flow chart in the manual, but nothing conclusive because it's so intermittent. I've tried a link between L and CH ON (bypassing any pre-boiler wiring / demand problems), I thought this had cracked it because the boiler fired up, but unfortunately this was probably because it had cooled down?! Back to square one!
I've tried with the 3-way switch (high/low/off) bypassed, still not joy. Also put a wire across the Hi thermostat to eliminate that. Could it be the air pressure switch, overheat cutoff switch, or do they only affect ignition after the fan has started. Just trying to get the logic right in my head......can anyone help?
Thanks
It gets to the stage where the fan should run, and it doesn't!
I've tried to run through the fault-finding flow chart in the manual, but nothing conclusive because it's so intermittent. I've tried a link between L and CH ON (bypassing any pre-boiler wiring / demand problems), I thought this had cracked it because the boiler fired up, but unfortunately this was probably because it had cooled down?! Back to square one!
I've tried with the 3-way switch (high/low/off) bypassed, still not joy. Also put a wire across the Hi thermostat to eliminate that. Could it be the air pressure switch, overheat cutoff switch, or do they only affect ignition after the fan has started. Just trying to get the logic right in my head......can anyone help?
Thanks