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Old 02-09-2009, 04:59 PM   #1
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Troubles with my Lennox Diplomat furnace...


The heat went on in the furnace last night and I'm a bit confused. It seems like everything is working besides the fan. The pilot is kicking in and the exhust fan is running, but the blower will not come on. I tried the AC and it came on just fine. Same with the fan option from "auto" to "on." Came on no problem. I'm not sure what it could be. Any info or suggestions would be greatly appreciated. Thanks in advance.

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Old 02-09-2009, 05:22 PM   #2
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Troubles with my Lennox Diplomat furnace...


Post the model and serial#. Should be inside by the burners.

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Old 02-09-2009, 05:24 PM   #3
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Troubles with my Lennox Diplomat furnace...


Could be a bad winding in the motors heating speed tap.
Or, it could be the furnace control boards heating fan speed relay is bad.
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Old 02-09-2009, 05:33 PM   #4
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Troubles with my Lennox Diplomat furnace...


Serial # : 6393E69829
Model # : 80MGF3-75A-1
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Old 02-09-2009, 06:39 PM   #5
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Troubles with my Lennox Diplomat furnace...


Beenthere is correct.
That unit is 15 yrs old and it looks like the heating fan relay is faulty. The new circuit board is a retrofit and EXTREMELY complicated to change. Not a DIY project. I would call a reputable Lennox dealer. May also be the motor. 90% board, 10% motor. I work on lots of them.
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Old 02-10-2009, 07:00 AM   #6
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Troubles with my Lennox Diplomat furnace...


Quote:
Originally Posted by yuri View Post
Beenthere is correct.
That unit is 15 yrs old and it looks like the heating fan relay is faulty. The new circuit board is a retrofit and EXTREMELY complicated to change. Not a DIY project. I would call a reputable Lennox dealer. May also be the motor. 90% board, 10% motor. I work on lots of them.
Agree, those and the G-24. P.I.A.
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Old 02-10-2009, 06:23 PM   #7
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Troubles with my Lennox Diplomat furnace...


G71. Lennox guy eh? I sell lots of them.

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