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About Craig HVAC Expert
Expertise
I have been in the HVAC field for the past 12+ years. I can help with most HVAC questions. I work on commerical buildings for the most part, and have yet to find anything I could not troubleshoot and repair, when repairable. I work on small 1 ton units to a 2500 ton chiller. Troubleshoot air flow, elect, and control problems. I attend regular classes to keep up with the latest and greatest.
Experience
I have work in the HVAC trade for the past sixteen years. I work on commerical sites, hospitals, gov't buildings. I can troubleshoot just about anything in the HVAC business.
Education/Credentials
5 years union trade school, VFD training classes, Liebert factory training, some York and Trane factory training.
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You are here: Experts > Home/Garden > Home Appliances > Heating, Air Conditioning, Fridge, HVAC > Commercial Rooftop Furnace won' stay lit
Expert: Craig HVAC Expert - 10/28/2009
Question
Carrier Commercial Rooftop Furnace
Model 48KL-024-311BF
48KL-024-300BF
About 1 1/2 years ago, I helped some friends replace the flame sensor on an old Carrier rooftop furnace on their old restaurant. They called Carrier and was told that the flame sensor was an LH33CM018. Upon replacing the sensor, the furnace worked.
Now, the furnace will not stay lit again. I had them pick up a new flame sensor. I installed it and the furnace will not stay lit. The electronic spark starts, gas flows and the pilot and burners light. They stay lit for about a minute. The fan then kicks on and blows out the burner and pilot light. The electronic sparking will start again, but the furnace does not re-light. Can you help me try to trouble shoot this problem?
Answer
If the furnace will light each and every time with the fan off and not with the fan on, then there are big problems. One problem that can cause the issue is a cracked heat exchanger. The unit needs to be inspected to be sure all is ok with the unit.
Craig
achelpguy@gmail.com
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