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I have a Lennox G51MP with Surelight. When I switch
When I switch thermostat to heat, lights indicate that a call was made for heat, Normal. However fan or ignition does not happen, no clicks...nothing … read more
Rick
Rick
HVAC Supervisor
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My furnace is a lennox furnace automatic gas furnace.... its
My furnace is a lennox furnace automatic gas furnace.... its turns on, the gas flame turns on and then it shuts off … read more
Rick
Rick
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My Lennox C33-60D-2F furnace isn't heating. The indicator
My Lennox C33-60D-2F furnace isn't heating. The indicator LEDs are slow alternate flashing yellow. … read more
airheatman
airheatman
Heating & Air Conditioning Contractor
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My Lennox Furnace seems to lose it capability to deliver
My Lennox Furnace seems to lose it capability to deliver heat after it has been on for a few hours. I go downstairs, turn it off and then on again. Then I go back up and turn the heat off and then on again using the thermostat. Then the furnace seems to deliver heat normally. Any thoughts as to what's going on? … read more
Rick
Rick
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I have a Lennox g51mp. It seems to time out for 2 or three
I have a Lennox g51mp. It seems to time out for 2 or three hours then start working again. When not working, both led's are slow flash. Once thermostat calls for heat, both lights go out. Then, if we … read more
airheatman
airheatman
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Changed out the control board, after the home owner changed
Changed out the control board, after the home owner changed the igniter. She now has heat, however the board still has the same green/red flashing pattern. Lennox G50UH-36B-090-10… read more
Theplumber717
Theplumber717
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I have Lennox mode C33-25A-2F93, serial number 6007F09765.
I have Lennox mode C33-25A-2F93, serial number 6007F09765. I got up this morning and adjusted my thermostat from 68 to 74, heard it click on and then off. Bumped the heat to 80, again heard it click o… read more
BillyHvac
BillyHvac
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State Licensed Mechanical Contractor
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I have a lennox G51MP gas burner, 8 years old- does not se
I have a lennox G51MP gas burner, 8 years old- does not seem to be working properly. I turned off the power and turned back on, and inside the unit, I can see a red and green light blinking ocntinuous… read more
airheatman
airheatman
Heating & Air Conditioning Contractor
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Hello, I have a dual energy system and I am having issues
Hello, I have a dual energy system and I am having issues with the ignition of my relatively new Lennox G51MP furnace. The thermostat is comunicating with the furnace as it will start and stop the fan… read more
Rick Mather
Rick Mather
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Vocational, Technical or Trade Scho
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HI, I have a G51MP furnace. Initial startup for the season.
HI, I have a G51MP furnace. Initial startup for the season. Everything looks normal for the first 5 minutes... gas starts to burn, then turns off. After 5 minutes, alternating fast flash on LED 1 & 2.… read more
BillyHvac
BillyHvac
Journeyman Service Technician
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My Lennox 80UGH furnace is about 12 years old now. Never any
My Lennox 80UGH furnace is about 12 years old now. Never any issues. Annual inspection/cleaning by local gas company, etc. Recently the gas company switched gas meters and this morning the furnace isn… read more
BillyHvac
BillyHvac
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i have a gas furnace. when the thermostat tells the unit to
i have a gas furnace. when the thermostat tells the unit to come on the led lights on the control circuit board go into a fast flash. the blower comes on then the igniter tries to light the furnace. T… read more
BillyHvac
BillyHvac
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Lennox Elite series furnace problem. It won't ignite.
I have a Lennox Elite series furnace that won't ignite. When i look in the glass to see what the indicator lights are doing I see rapid alternating flashes. The trouble guide says this could be due to… read more
Matthew
Matthew
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Bachelor's Degree
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Hello, We have a 2 G51MP units for our house which are 4 yrs
Hello, We have a 2 G51MP units for our house which are 4 yrs old. A few days ago the unit to the second floor of the house stopped pushing heat. The thermostats are fine (switched upstairs and downsta… read more
Tim H.
Tim H.
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my lennox g51mp series furnace keeps shuting off and will not
my lennox g51mp series furnace keeps shuting off and will not restart unless i turn off the thermostat and restart it. i was able to keep it working fine for two weeks set at 67, but when i moved the … read more
BillyHvac
BillyHvac
Journeyman Service Technician
State Licensed Mechanical Contractor
13,933 satisfied customers
I have a G51mp furnace that will not turn on. I can manually
I have a G51mp furnace that will not turn on. I can manually turn on the fan at the thermostat, but it will not turn the heat on. I have turned off the main power switch for a minute for a total reset… read more
BillyHvac
BillyHvac
Journeyman Service Technician
State Licensed Mechanical Contractor
13,933 satisfied customers
My gas furnace has been intermittently stopping. Several times
My gas furnace has been intermittently stopping. Several times the last few days we would wake up to very cold because furnace wasn't running. When we turn thermostat off and on, it comes on immediate… read more
Matthew
Matthew
HVAC Technician
Bachelor's Degree
2,014 satisfied customers
I am sitting in Boulder Junction Wi with a G51MP series furnance
I am sitting in Boulder Junction Wi with a G51MP series furnance that alternately stops and starts. It gives a fast alternating flash error. It is 10 below zero. There are no clogs in the intake or th… read more
BillyHvac
BillyHvac
Journeyman Service Technician
State Licensed Mechanical Contractor
13,933 satisfied customers
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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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