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I have a Lennox G61MP furnace that stopped heating. I

Customer Question
I have a Lennox...

I have a Lennox G61MP furnace that stopped heating. I believe it was due to a dirty filter. I replaced the filter. Not sure how to get it going again if the old filter caused the limit control to shut the unit off..?

Contractor's Assistant: Thanks. Can you give me any more details about your issue?

That's it.

Submitted: 2 years ago.Category: HVAC
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Answered in 15 minutes by:
2/19/2016
HVAC Technician: airheatman, HVAC Technician replied 2 years ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 9,377
Experience: Furnace, A/C and heat pump specialist.
Verified

Did you get a limit error on board?

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Customer reply replied 2 years ago
I am not yet sure. At work now and have not checked the board, and have no experience reading the error codes on the board.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

If furnace shut down because of dirty filter,you may have two limits on back of blower housing that trip and a main limit in furnace vestibule.Most of these are auto reset and will rest themselves once cooled down,Some have a small button in center that pushes in to reset.When you get home,Lets turn power off and back on to furnace .Then call for heat and see if furnace will light or what error code we get by light on board.

I will help you diagnose the code.Just let me know what lights do for example 3 and 1 indicates an open limit.

We can go from here.

Also

We would may a meter to troubleshoot. You can get an inexpensive one at Walmart for about 15 bucks if you would like to troubleshoot and I would be happy to guide you.

http://www.walmart.com/ip/Innova-3300-Equus-3300-Hands-free-Digital-Multimeter/14644665

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Customer reply replied 2 years ago
Ok, thanks. Will follow those instructions and see what code I get and let you know. Thanks.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Sound good, we will go from here

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Customer reply replied 2 years ago
I checked the board and it is signaling a pulse - 1/4 second flash followed by 4 seconds of off time - which the manual says means "power on - Standby". Should it be working?
Customer reply replied 2 years ago
I pressed reset on the thermostat and tried to turn on the heat. It did not come on and now the board is signaling 2+4, which reads as "low pressure switch failed closed".
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

On call for heat did the small inducer vent motor come on?

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Customer reply replied 2 years ago
No, nothing came on when I called for heat. At least not when the fan is set for auto.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Ok do you have a volt meter to see if the vent motor is getting power?That is the very first thing that has to happen so it will draw a vacuum on pressure switch.

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Customer reply replied 2 years ago
I don't. Will get one tomorrow.
Customer reply replied 2 years ago
It is working now. Thanks.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

If you have further questions, please let me know.

Thanks for letting me work with you.If my answer has been polite, professional,and thorough, please click one of the ratings before you go. If you still need help let me know!.Expert is not paid for assisting you until you rate answer.Feel free to follow up for 30 days at no additional cost. Bonus always appreciated if you feel justified.

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