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Old 12-21-2010, 03:05 PM   #16
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No Heat: Pressure switch & Hoses forming traps


Replace the pressure switch, they are cheap and develop intermittent sticking problems. Try cozyparts.com a Lennox dealer but Lennox owns AireFlo so they may get you parts. The gas valve has nothing to do with the pressure switch.

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Old 12-21-2010, 05:01 PM   #17
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No Heat: Pressure switch & Hoses forming traps


dumb valve is probably the problem
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Old 12-21-2010, 05:10 PM   #18
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No Heat: Pressure switch & Hoses forming traps


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Originally Posted by hvactech126 View Post
dumb valve is probably the problem
That's a safe bet.
Wiggle the wires going into the gas valve yooper. Those valves are well known to be trouble makers.
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Old 12-21-2010, 05:18 PM   #19
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No Heat: Pressure switch & Hoses forming traps


It may be but the press switch codes go thru the circuit board separate from the dumb valve on the first models so they are separate. I have replaced a bunch of those switches on units 5-6 yrs ago when we sold them.

Is the code from the green light on the gas valve or one from an LED on the circuit board?
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Old 12-22-2010, 09:54 AM   #20
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No Heat: Pressure switch & Hoses forming traps


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Originally Posted by yuri View Post
It may be but the press switch codes go thru the circuit board separate from the dumb valve on the first models so they are separate. I have replaced a bunch of those switches on units 5-6 yrs ago when we sold them.

Is the code from the green light on the gas valve or one from an LED on the circuit board?
The green light is on the gas valve...don't tell me I've been barking up the wrong tree this whole time...? If so, my apologies for being uninformed.
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Old 12-22-2010, 09:57 AM   #21
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No Heat: Pressure switch & Hoses forming traps


I blew some more water through the condensate trap last night, situation is still as described above. I'm a little confused as to why water being in the condensate trap would ever be an issue...isn't there supposed to be water in there?

Anyways, I guess I'll shop around a bit for a pressure switch in case I need to order it. Not sure where I'm going from here, but I really appreciate all of the advice given so far...thanks!
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Old 12-22-2010, 10:07 AM   #22
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No Heat: Pressure switch & Hoses forming traps


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Originally Posted by Marty S. View Post
That's a safe bet.
Wiggle the wires going into the gas valve yooper. Those valves are well known to be trouble makers.
I'll be glad to give that a try...I've read about corrosion on these wires, but none seems evident. Will try wiggling wires.
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Old 01-04-2011, 09:52 AM   #23
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No Heat: Pressure switch & Hoses forming traps


The latest update. Situation is still as described above (can work it by turning gas control off, then on).

Found a pressure switch from Lennox for $82 - maybe I should order that and try it, but need to test it first to be sure it's working or not.

Wiggling wires on the gas control does not seem to have any effect.

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