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Old 02-25-2012, 09:13 PM   #16
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Payne Heater Problem


The pressure switch would not hold a vacuum and was bad. Just replaced, holds the vacuum, but still error 31. Bypassed the draft safety switch and still error 31.

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Old 02-25-2012, 09:53 PM   #17
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Payne Heater Problem


Did you turn off the power to the unit to allow the board to reset after the initial code 31?
Does the tube from the inducer to the pressure switch have a t-fitting and another tube on it to any other location?

The board first needs to measure that the pressure switch is open before the inducer starts or you'll get a fault code. If you are trying a bypass of the pressure switch, you need to wait until the inducer starts up before you can jumper it or you'll just get a fault code again.

How do you know your pressure switch is holding a vaccum and are there n/o and n/c connections on the pressure switch? If so, are you wired to the right ones?
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Old 02-25-2012, 10:24 PM   #18
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Payne Heater Problem


The power was turned off after installing the pressure switch.

Single tube to pressure switch.

Inducer starts and pulls the little nub on the back of the pressure switch in and it stays in until inducer motor stops.

Two wires on switch. The Com with a yellow wire goes to the circuit board, and the N/O N/C with an orange wire going to the blower.
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Old 02-27-2012, 05:49 PM   #19
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Payne Heater Problem


Today I was checking voltages on all the limit switches and the Ohms for the Igniter. Everything was checking fine until I tested the Draft Limit Switch. The voltage on the side coming from the pressure valve was 25 volts. The side going to the circuit board only had 14 volts. But, as soon as I touched that side with the OHM meter the heater came on and is still running after 1/2 hour.

Does anyone know which part number I would need for a replacement? If and when the heater stops running, will take switch out and see if there is a part number. Payne forced air heater, model 373 LAU 048115. Manufactured in 1995.

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