Author Topic: No Blower/Heat Lennox GCS16  (Read 3656 times)

Offline Okanagan

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No Blower/Heat Lennox GCS16
« on: December 13, 2010, 11:39:08 PM »
Hiya - My furnace is a Lennox GCS16 series. The furnace worked fine last season, but now the fan is not coming on. It is an outdoor unit and Im just wondering if there is anything I can do to try and correct the problem before calling a technician. Last week I tried turning off the unit for 30 minutes at the thermostat and this seemed to make it work again but only for a short while. Now when I turn it on I just hear a whirring noise but no fan coming on. The fan works fine when I put it in the on position at the thermostat but nothing in auto.  ???

Offline Admin

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Re: No Blower/Heat Lennox GCS16
« Reply #1 on: December 14, 2010, 07:04:49 AM »
It sounds like the exhaust motor is running but no ignition.  It could be a dirty flame rod, bad ignition module or worn electrode.  You will probably need service.

Offline Okanagan

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Re: No Blower/Heat Lennox GCS16
« Reply #2 on: December 14, 2010, 12:20:45 PM »
Thanks Admin : I think you may be right. After shutting everything off and restarting, it worked for a few minutes including flame but then nothing on a second attempt (no flame on 2nd try). I just dont know where to start so calling a tech  ;)

Offline Admin

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Re: No Blower/Heat Lennox GCS16
« Reply #3 on: December 14, 2010, 05:22:17 PM »
That sounds like flame failure.  That will be an inexpensive service call.  You shouldn't need any parts, just a cleaning.

Offline Okanagan

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Re: No Blower/Heat Lennox GCS16
« Reply #4 on: December 15, 2010, 12:32:32 PM »
Ok tech has been here - he replaced the DSI Control (175$) suggesting some of the circuitry was failing. He also checked the Flame Rod and found it to be fine. Furnace is now responding normally. I will update this thread if anything goes wrong over the heating season. Thanks all.