Payne with power venter problem
The relay has to release and then the ventor fan slows down, loses vacuum and then the pressure switch opens and the board checks for that B4 it allows another cycle to start. There usually is a timing circuit to prevent nuisance lockouts but I suspect your board is faulty. You are confusing it. I have worked on hundreds of those units and replacing circuit boards with intermittent problems happens all the time. Relays wear out and stick and solder joints break on those older boards. There should be NO call for heat B4 the ventor fan shuts down unless your tstat is faulty and short cycling or cutting in for no reason. Try a new Honeywell Focus Pro tstat from HDepot if that is the case.
"Cut it twice and it is still too short".
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Last edited by yuri; 12-11-2010 at 01:04 PM.