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I have an old Lennox elite series gas furnace from 1985-90.

Customer Question
I have an old...

I have an old Lennox elite series gas furnace from 1985-90. When it turns on, it runs for maybe a minute and then shuts off, even if the thermostat is signalling for more heat. Any suggestions are welcome. Thanks!

Contractor's Assistant: Did you double-check the thermostat's settings? And what about the filters?

I think they are both okay, but I will get new filter.

Contractor's Assistant: Do you plan on doing the work yourself?

If possible

Submitted: 7 months ago.Category: HVAC
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Answered in 4 hours by:
12/29/2017
HVAC Technician: gotoman for ac, HVAC Technician replied 7 months ago
gotoman for ac
gotoman for ac, HVAC Technician
Category: HVAC
Satisfied Customers: 5,357
Experience: 51 years of experience install design and repair of all makes and models of AC
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Russ here. Does he fan turn on. Russ

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Customer reply replied 7 months ago
the fan turns on when the furnace fires up. If the furnace doesn't turn on when it's supposed to based on thermostat, it seems to reset by turning furnace wall switch off for a few minutes. Then when switched back on, furnace works okay for several hours or even days.
HVAC Technician: gotoman for ac, HVAC Technician replied 7 months ago

Ok. On the furnace check to see if you have a furnace board in blower compartment. Really need the model number.Russ

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HVAC Technician: gotoman for ac, HVAC Technician replied 7 months ago

That is furnace board. The bot***** *****ghts should be lit. Russ

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Customer reply replied 7 months ago
Both are currently flashing while heat is working.
HVAC Technician: gotoman for ac, HVAC Technician replied 7 months ago

The furnace door has to be closed for them to light

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Customer reply replied 7 months ago
True. But what do I do when it stops working again?l?l
HVAC Technician: gotoman for ac, HVAC Technician replied 7 months ago

Does the furnace fir and wirk.

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Customer reply replied 7 months ago
I have already explained the problem in some detail if you look at my previous comments. Currently, the furnace is working properly. But 6 times in the past few days, it has stopped working while the temp in the house drops significantly. At those times, I restarted the furnace by turning off the furnace wall switch for several minutes and then flipped the switch on again. So far, each time the furnace started working but later fails at random times.
HVAC Technician: gotoman for ac, HVAC Technician replied 7 months ago

Opt out.

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