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I have a Lennox furnace, it says Primary/Secondary Limit
i have a Lennox furnace, it says Primary/Secondary Limit Switch . Where do I find these 2 limit switches … read more
airheatman
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I have a lennox furnace that stopped blowing, just changed
I guess it is either the motor or is there other parts to help the motor run? I know that Diag. 1 is flashing and diag 2 is on… read more
Rick
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My furnace start wont turn on it says primary secondary
my furnace start wont turn on it says primary secondary limit switch open its a lennox … read more
gotoman for ac
gotoman for ac
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My name is ***** ***** Furnace says primary/secondary limit
my name is ***** ***** Furnace says primary/secondary limit switch is open. I have no heatRead more: http://www.justanswer.com/hvac/5xtig-furnace-says-primary-secondary-limit-switch-open-no-heat.html#… read more
airheatman
airheatman
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I have a Lennox ch33 and woke up to the fan running but no
I have a Lennox ch33 and woke up to the fan running but no heat. Went up in the attic and opened it up. When it gets a signal from the thermostat to run, both flashing lights change to flashing red co… read more
BillyHvac
BillyHvac
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Have a Lennox G27M4-100A-1 (S/N 6397H00831) with a 63K8901
Have a Lennox G27M4-100A-1 (S/N 6397H00831) with a 63K8901 board. Board has failed where the blower doesn't come on and it trips the main limit just like it should. I got the thing working by basicall… read more
A-1 Tech
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I have a Lennox 80uhg3-60a-2 Furnace. My problem is the funace
I have a Lennox 80uhg3-60a-2 Furnace. My problem is the funace is trying to light, burners come on and run for about 15 to 30 seconds, but the main blower never comes on. According to the chart in the… read more
BillyHvac
BillyHvac
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I Have a Lennox C33-36A-2F-2 unit..... The green light is
I Have a Lennox C33-36A-2F-2 unit..... The green light is on and the red light is slow.....the diag code says either the primary/secondary limit switch is open or that the watchguard mode limit is on … read more
BillyHvac
BillyHvac
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I have a elite model ghr26q3-75 My problem is that the furnace
I have a elite model ghr26q3-75 My problem is that the furnace will start and run for a bit then shut down it shows a error code of left led on right led slow flash I cleaned filter and then removed f… read more
servtech50
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I have a lennox gas furnace/ac model c26-41fc which fired
I have a lennox gas furnace/ac model c26-41fc which fired up once then went into a led 1 slow flash led 2 led on mode. The main blower continued a few minutes then shut off. The furnace didn't finish … read more
M Oglesby
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Vocational, Technical or Trade Scho
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I have a Lennox G2603-75-3 that the blower is running constantly
I have a Lennox G2603-75-3 that the blower is running constantly but will not ignite. The Diag lights show that the Primary/ Secondary Limit Switch is open. How do I find the limit switch so I can res… read more
BillyHvac
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I have a Lennox G40UHX series furnace, and its not working.
I have a Lennox G40UHX series furnace, and it's not working. The LED #1 red indicator is flashing slow, and the LED #2 indicator green is solid.… read more
BillyHvac
BillyHvac
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State Licensed Mechanical Contractor
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I have a lennox G26 furnace. The fan runs and blows cold air.
I have a lennox G26 furnace. The fan runs and blows cold air. The LED indicator was the left light flashing slow and the right light was solid, this indication based on the info on the cover of the fu… read more
gotoman for ac
gotoman for ac
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I have a Lennox G50UH-48C-110-02 furnace that is not making
I have a Lennox G50UH-48C-110-02 furnace that is not making heat this evening. LEDs are slow flash/ON meaning primary/secondary limit switch open. What do I do to fix this… read more
gotoman for ac
gotoman for ac
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I have a problem with a Lennox G50UH(X) Series No heat. 1st
I have a problem with a Lennox G50UH(X) Series No heat. 1st small blower motor to flue starts up for short period. Then main blower motor starts. No flame no heat. I checked the flue and chimmeny are … read more
Mike
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I have a Lennox G27m4-100A-1 furnace and the Diag Lights says
I have a Lennox G27m4-100A-1 furnace and the Diag Lights says the Primary/Secondary limit Switch Open. I also heard the blower bearings making a noise prior to this.… read more
Jason  Hvac
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I have a lennox merit c33-36c-2f. On Sunday, woke up and the
I have a lennox merit c33-36c-2f. On Sunday, woke up and the furnace was not running. Shut it off at the breaker, and turned it back on and it ran til this morning--noticed it was off this afternoon w… read more
BillyHvac
BillyHvac
Journeyman Service Technician
State Licensed Mechanical Contractor
14,494 satisfied customers
i have a g26q3-50-6. it is blowing cold air only. it has
i have a g26q3-50-6. it is blowing cold air only. it has a diagnostic code led #1 flashing slow and led #2 on. it says that this is a primary/secondary limit switch open. what does this mean and what … read more
BillyHvac
BillyHvac
Journeyman Service Technician
State Licensed Mechanical Contractor
14,494 satisfied customers
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