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Discovered i had mains feed to the thermostatic cut out, but no output voltage despite the switch not being triggered. i shorted across the thermostatic cut out to feed the burner ignition and it fired up. bizarely when i removed the temporary short, everything worked as it should! if it goes...

Thanks all for your suggestions. High water pressure (although pressure guage is stuck..) Perforated expansion tank full of water No loose/failed connections as far as I can tell. Voltage to pump & divertor working correctly. No voltage being sent down to the burner from the pcb new...

Hi all, my 10 yr old heatslave has stopped firing up with no prior signs of problems. the over heat thermostat has not tripped out, no lock out, no problems with CH/hot water diversion. annually serviced and clean burning at last service according to flue gas analysis. had all the baffles out...

it's stainless steel twin wall i think. the leak i've spotted is at the seal between the inner & outer walls, as the flue widens directly after the coupling with the boiler. this surfaces faces downwards, about 2" above the boiler top. (which is why i had to use a mirror to see it). cheers

thanks boilerman2. i have now found some evidence of leaks in the flue joints - using a mirror and phone camera!! i could use plumba flue sealant externally to avoid dismantling the flue, although this would be a bit of a bodge job. the flue was originally sealed using traditional fire...

hi all - i hope you can help me resolve the fine sooty dust being produced by my heatslave. my oftec oil/aga/rayburn specialist has applied plumba flue sealant around the flue/boiler coupling twice but i still get fine soot being produced. 2 hours running time will produce a fine layer on...