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Old 12-18-2008, 12:19 AM   #1
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15 yr old Payne Plus 90 not lighting


I have an older Payne Plus 90 furnace that when we started using it this fall had water backing up in the exhaust fan area which started leaking and burned out our circuit board.

I have replaced the circuit board and opened the drain line but the hot ignite plate is not lighting all the time. For awhile if I taped on the little silver vacuum looking thing on the right side of the exhaust motor(I know I'm getting very technical here with all these big terms but just stay with me) the igniter would light.

Any help on what more I need to clean out? I blow though most of the drain lines and one did seem plugged that went into a black box type thing against the main part of the furnace that also has a line going to the silver vacuum thing but I was afraid to take that black box a part.

Does any one know what all has to be cleaned out or where there might be info about this?

Thanks

I took everything a part tonight. Cleaned all drain lines and put black stove sealant on all joints that I took a part to make sure everything was sealed.

Still won't light?

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Old 12-18-2008, 07:21 AM   #2
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15 yr old Payne Plus 90 not lighting


Some of these furnaces have secondary heat exchanger problems.
The heat exchanger will probably be covered by mfg. warranty.
The heat exchangers are coated with a material to keep them from rusting. This material is peeling off (de-laminating) and tends to plug up the drains and secondaries. This will have to be inspected and replaced by an authorized dealer. Will be labor charges.

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Old 12-18-2008, 08:05 AM   #3
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15 yr old Payne Plus 90 not lighting


Probably has moisture in the pressure switch.(silver thing)

May be able to get teh moisture out.
May need to replace it.
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Old 12-18-2008, 11:23 PM   #4
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15 yr old Payne Plus 90 not lighting


I'll start with the pressure switch and see if it will run steady than look into the coating problem.

Thanks for the help!!!
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