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Model: G20Q3/4E-100-3	Brand: -other-	Age: 5 - 10 years
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fixerguy123		#1 Posted : Monday, July 9, 2012 7:49:52 PM(UTC)
Rank: Member Groups: Registered Joined: 7/9/2012(UTC) Posts: 3		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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fixerguy123		#2 Posted : Tuesday, July 10, 2012 5:55:58 AM(UTC)
Rank: Member Groups: Registered Joined: 7/9/2012(UTC) Posts: 3		Originally Posted by: fixerguy123 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?


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