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A/C Issue - Lennox furnace

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No ground at Compressor ground terminal on PC board inside furnace. 24V found at Y wire / positive to compressor

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  #1 (permalink)  
Old 07-09-2012, 09:49 PM
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Default A/C Issue - Lennox furnace
Model Number: G20Q3/4E-100-3   Brand: -other-   Age: 5 - 10 years   

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No ground at Compressor ground terminal on PC board inside furnace.

24V found at Y wire / positive to compressor terminal with meter grounded to chassis when T-Stat in in "cool" mode.

Jumper from Chassis (internal transformer) ground to compressor ground wire makes compressor function normally.

No issue with heat side. All wires from T-Stat test as normal.

Can I assume that the PC board in the furnace needs to be replaced?


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  #2 (permalink)  
Old 07-10-2012, 07:55 AM
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Default

Quote:
Originally Posted by fixerguy123 View Post
No ground at Compressor ground terminal on PC board inside furnace.

24V found at Y wire / positive to compressor terminal with meter grounded to chassis when T-Stat in in "cool" mode.

Jumper from Chassis (internal transformer) ground to compressor ground wire makes compressor function normally.

No issue with heat side. All wires from T-Stat test as normal.

Can I assume that the PC board in the furnace needs to be replaced?

I was reminded that I should have said "I had to jump the COMMON compressor wire to the chassis to bypass the "C" terminal." I was thinking in terms of DC wiring rather than low voltage AC when I used the term "ground"

Anyone out ther have a schematic for this board? Lennox 48K98 . This is a friend's furnace. I'm just helping someone who's down on their luck.

All other BCC board related functions seem normal. If this contact is the only one made by this terminal, can I simply make this temporary contact more permanent and save her some money?

Last edited by fixerguy123 : 07-10-2012 at 08:44 AM.
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