Lennox high-efficiency furnace needs new inducer motor?

Old 11-14-11, 02:47 PM
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Lennox high-efficiency furnace needs new inducer motor?

Our 5-year-old Lennox G61MPV high-efficiency gas furnace stopped working last night. It gave an LED error code that the low pressure switch failed to open. Today a local technician came by and said we need a new inducer motor. Does this make sense? It's going to take him a day or two to get one and we have some cold weather on the way.

My understanding is that the low pressure switch is normally open, and the inducer motor causes it to close. I just wondered if we were on the right track or I should contact someone else.

Thanks, Andy
Old 11-14-11, 03:11 PM
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No expert...but it's pretty easy to tell if the inducer motor failed. When the furnace calls for heat, the motor should power up and spin up to speed quickly. You can hear it and feel it.

If it turns out not to be the problem, you don't pay for the part or an additional trip charge. He should have done a few simple tests to see if that was the issue or not.

As to the open/closed thing on the switch..I dunno.
Old 11-14-11, 03:13 PM
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You are correct on the operation of the pressure switch.

Does the inducer motor appear to switch on when the thermostat calls for heat and spool up to what appears to be a typical operating speed?

A good many furnaces test to see if the pressure switch opens as it should when the inducer motor is off. That's a check that it is opening and closing properly, not just sticking in one position.

Hence the diagnostic code you have --- presumably.
Old 11-14-11, 07:34 PM
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Sounds legitimate but as others have suggested that may not necessarily be the cause of your problems. Also, you should have either a 5 year warranty from Lennox or the 10 year extended one, I'd check out your invoice from the installation and look into that.

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