Quattro TrueBlue 90 - http://www.hvacmechanic.com/ Forums
Original message
| graynn
 |  "Quattro TrueBlue 90"
, posted Sat 12 Apr 20:51  
Having trouble with my propane furnace. When the thermostat trips the furnace on the draft motor begins running as it should. But that is as far as it goes. I don't believe I am getting any flame (pilot), and for sure not getting a main burn. I've test voltages and I know the main blower fan runs (Tested this with the heat off, and turned fan on at the thermostat). I've also watched the diaphram attached to the pressure switch. I can watch it pull and hear the switch trip. What I can't figure out is why the state is not fully changing on the pressure switch. The switch should change from normally closed to normally open(I'm assuming). But when I check continuity I have it both ways, like the switch isn't fully tripping. I disconnected the normally closed wire and the draft fan is still the only thing that runs. Is there something else that should make the gas controller work? It seems like the switch tripping should ignite the pilot, then the main burn. Finally the main blower should run. I'd appreciate any help.
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| "Re(1):Quattro TrueBlue 90" , posted Tue 15 Apr 23:31
pressure swotches are pretty hardy next thing is a roll out safty a dime sised sensor on the flame hood, then the gas valve its self, is it a tan plastic top??? hold the wires into the gas valve and try to light the furnace. I have seen alot of these with broken solider joints in side the gas valve, if it works replace the valve.
Be good to your fellow man not nice there is a difference.
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| "Re(1):Quattro TrueBlue 90" , posted Tue 15 Apr 23:31
pressure swotches are pretty hardy next thing is a roll out safty a dime sised sensor on the flame hood, then the gas valve its self, is it a tan plastic top??? hold the wires into the gas valve and try to light the furnace. I have seen alot of these with broken solider joints in side the gas valve, if it works replace the valve.
Be good to your fellow man not nice there is a difference.
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