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I have a 25 year old Lennox gas heat system. It has worked…

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I have a 25 year...
I have a 25 year old Lennox gas heat system. It has worked great until now. It runs fine for two/three nights and the it just dies not turn on. I turn the system off via the thermostat and the flip the breaker. After 20 seconds I turn it back on and the system is fine again fir 2/3 nights. Any ideas????
Submitted: 7 months ago.Category: HVAC
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Answered in 14 minutes by:
12/2/2017
HVAC Technician: HVAC Guru, HVAC TECH replied 7 months ago
HVAC Guru
HVAC Guru, HVAC TECH
Category: HVAC
Satisfied Customers: 18,713
Experience: 20yrs in the HVAC industry with certificates and degrees.
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One moment please..Note it takes time to type and add links so please be patient. Also the site will send you a phone call offer, that is not me.

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HVAC Technician: HVAC Guru, HVAC TECH replied 7 months ago

Do you have a battery powered thermostat?

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Customer reply replied 7 months ago
The battery is only for the backlight. I have replaced the batteries and tried a new thermostat as well.
Customer reply replied 7 months ago
Thanks for the heads up on the call offer!!!!
Customer reply replied 7 months ago
Air intake is clear and the condensate line is flowing. I tried to think of items that would cause a safety shut off.
Customer reply replied 7 months ago
Only other thing I can imagine is a flame detector or circuit board.
HVAC Technician: HVAC Guru, HVAC TECH replied 7 months ago

Was a safety limit shut off?

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Customer reply replied 7 months ago
I don’t know how to tell.
HVAC Technician: HVAC Guru, HVAC TECH replied 7 months ago

DOes it doe anything at all?

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