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The furnace comes on for a few minutes, then goes off.
The furnace comes on for a few minutes, then goes off. … read more
airheatman
airheatman
Heating & Air Conditioning Contractor
6 years college
10,295 satisfied customers
I have a c33-36b-2f lennox furnace and the fan comes on but
I have a c33-36b-2f lennox furnace and the fan comes on but I don't see the burner turning on. What could be the problem? … read more
airheatman
airheatman
Heating & Air Conditioning Contractor
6 years college
10,295 satisfied customers
I have a c33-30a-2f-4 system. The heat is coming on, but not
I have a c33-30a-2f-4 system. The heat is coming on, but not staying on through the full cycle consistently. The light codes indicate alternating slow (R&G) and slow R, fast G. Do I need a new sensor?… read more
airheatman
airheatman
Heating & Air Conditioning Contractor
6 years college
10,295 satisfied customers
I have a lennox c33-36b-2f furnace. Has been running with no
I have a lennox c33-36b-2f furnace. Has been running with no issues, thermostat was lower than setpoint and wasnt starting, it is showing alternating slow flashes, reset breaker and came back on, ran … read more
Rick
Rick
Supervisor
29,223 satisfied customers
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
6 years college
10,295 satisfied customers
My heater is only running for a few seconds and the is
My heater is only running for a few seconds and the is shutting off. What would be the cause?… read more
Michael Ferryman
Michael Ferryman
225 satisfied customers
Furnace starts heats fine- igniter glows orange, blue flame
Furnace starts heats fine- igniter glows orange, blue flame starts and blower work fine. On reaching room temp- furnace goes into cool down mode, but does not shut off after 2-3 minutes, just blower s… read more
airheatman
airheatman
Heating & Air Conditioning Contractor
6 years college
10,295 satisfied customers
Working on a Ruud Silhouette II furnace, we replaced the
Working on a Ruud Silhouette II furnace, we replaced the induced draft motor and on restart only 1 burner ignited. Furnace shut off after a few seconds. On restart same thing happened but after that t… read more
Phil
Phil
Mechanical Engineer
Degree, Mech Engr Technology
8,427 satisfied customers
Our Lennox C33-48C-2F furnace only turns on when I push the
Our Lennox C33-48C-2F furnace only turns on when I push the black button..and than only for a while. What suggestions would you have to fix this so it permanently turns on? Thanks… read more
Tim H.
Tim H.
Lead building engineer
Vocational, Technical or Trade Scho
3,962 satisfied customers
Have a c33-24B-2F furnace in my attic. wont work. Hot surface
Have a c33-24B-2F furnace in my attic. won't work. Hot surface ignition comes on but burner will not. have both green and red lights blinking on my control board. did drain my condensate (there was a … read more
Matthew
Matthew
HVAC Technician
Bachelor's Degree
2,014 satisfied customers
We have a Lennox furnace [ Model G24M3/4-100A-2; Serial #6395C31989
We have a Lennox furnace [ Model: G24M3/4-100A-2; Serial #6395C31989 ] with a weird problem. After many visits from our plumbing/heating company over the past year in which we essentially rebuilt the … read more
Mr. Jeff Pearson
Mr. Jeff Pearson
Refrigeration Systems
Associate Degree
155 satisfied customers
i have been having trouble with my lennox g51 mp furnace, but
i have been having trouble with my lennox g51 mp furnace, but i am not getting the help i need. i have to turn my thermostat 78 to get my furnace to kick on while the temp is only 60. it will run for … read more
M Oglesby
M Oglesby
Vocational, Technical or Trade Scho
2,038 satisfied customers
We have a Lennox G61MPV, with a humidifier, hooked up to a
We have a Lennox G61MPV, with a humidifier, hooked up to a Honeywell VivionPRO (R) TH8000 series thermostat. It has been comfortable all day long. We noticed that even though the temperature has been … read more
Matthew
Matthew
HVAC Technician
Bachelor's Degree
2,014 satisfied customers
I have a Lennox C33 48C 2F heater that will not light. I took
I have a Lennox C33 48C 2F heater that will not light. I took the panel off and see alternating flashing lights when it trys to ignite. Is there anything I may be able to do to fix the problem myself … read more
M Oglesby
M Oglesby
Vocational, Technical or Trade Scho
2,038 satisfied customers
The church has a Rheem Imperial Drum 90 Plus furnace for the
The church has a Rheem Imperial Drum 90 Plus furnace for the sanctuary. When we switched from cooling to heating it run only run 10-15 minutes and shut off. If we turned off the thermostat and turned … read more
Richard
Richard
District Technical Manager
Vocational, Technical or Trade Scho
1,514 satisfied customers
The fan/blower does not shut off when the thermostate control
The fan/blower does not shut off when the thermostate control is in the off position. Also, the fan does not turn off when it is in the "auto" position and the air conditioner turns off automatically.… read more
Tim H.
Tim H.
Lead building engineer
Vocational, Technical or Trade Scho
3,962 satisfied customers
I have a Lennox Merit Series Model C33-24A-2F gas furnace.
I have a Lennox Merit Series Model C33-24A-2F gas furnace. Am having sometimes of it not going thru the entire cycle. The ignitor will glow, the burners will ignite, and after a short while it will th… read more
Jim Burgess
Jim Burgess
HVAC/APPLIANCE TECH
Vocational, Technical or Trade Scho
92 satisfied customers
I have a Lennox Elite, Model C33-30A-2f Furnace in the
I have a Lennox Elite, Model C33-30A-2f Furnace in the attic. We have a Lennox Model 49M55, 49M56, 49 M57 programmable Thermostat. There is no heat coming from the registers. On the thermostats, the r… read more
M Oglesby
M Oglesby
Vocational, Technical or Trade Scho
2,038 satisfied customers
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Meet the Experts:

Phil

Phil

Mechanical Engineer

8,427 satisfied customers

Retired HVAC/ Electrical & Boiler contractor. Industrial

Rick Mather

Rick Mather

HVAC Technician

3,133 satisfied customers

35 years experience, HVAC

Matthew

Matthew

HVAC Technician

2,014 satisfied customers

14 years experience in the HVAC field of service, installation, Manual J & D calculations

Brian HVAC Guy

Brian HVAC Guy

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I have been an HVAC/R mechanic/technician for 30+ years.

Kenton Guidry

Kenton Guidry

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12 years install/service experience.

Tom

Tom

HVAC Technician

770 satisfied customers

16+yrs HVAC/R service. Residential Commerical Industrial

A-1 Tech

A-1 Tech

Service Manager

526 satisfied customers

I have been in the HVAC business for over 40 years.

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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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