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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...

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...