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About Joe
Expertise
Answer questions pertaining to Residential and Commercial Air Conditioning and Heat Pump systems. Mechanical and Electrical troubleshooting of these units.Be as detailed as possible when describing problem.Packaged unit vs split systems.Give age of eqiuptment.And what type of heat,Heat Pump,Oil, Gas ,or Electric.
Experience
35 years experience, diversified HVAC/R . Installation and Troubleshooting, Mechanical and Electrical, in following areas, Refrigeration( Walk in and Reach in Coolers and Freezers )Commercial Roof Top and Packaged Heating/Cooling ( Natural Gas,Propane, Electric, and Heat Pumps ) Computer Room Air Conditoning Systems,Commercial Chilled Water Air Handlers and Recipercating Compressors. Residential Packaged and Split Systems Air Conditoning and Heat Pumps.Warm Air Oil and Natural and Propane Gas Heating systems.
Education/Credentials
Graduated from Private Technical School in 1975.Presently an HVAC/Refrigeration Contractor. Have Unlimited Heating/Piping and Cooling Contractor License.Limited Sheetmetal Contractors License.NATE Certifield. York Certifield Heat Pumps in 1981. Served 33 years combination Active Duty Air Force ,
Air Force Reserves and Air National Guard in the HVAC/Refrigeration Shop.Starting as a Apprentice then Technician troubleshooting/installing HVAC/Refrigeration Equiptment Worldwide. Retiring in 2003 as a Mechanical Superintendent.
Awards and Honors
I got many atta boy awards over the years
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You are here: Experts > Home/Garden > Home Appliances > Heating, Air Conditioning, Fridge, HVAC > Heil gas furnace blows cold air continuously
Expert: Joe - 11/1/2009
Question
I have a natural gas furnace made by Heil. The model number is NTC6075FBA1. The serial number is L984120332.
A few times over the past year, I've noticed the furnace blowing cold air constantly. I "solved" the problem by shutting off the furnace via the circuit breaker, and then turning it on again a few hours later. Unfortunately, this method doesn't work anymore.
The furnace constantly blows cold air, and the heat never comes on. The thermostat was an old-fashioned dial-type model. I replaced it with a modern electronic thermostat made by Honeywell. Didn't make any difference. Changing the temperature-setting on the thermostat has no effect.
When I take off the upper panel of the furnace while it's blowing, it looks to me like there is a pilot light burning. But I don't know anything about furnaces, so I don't know what else to look for.
The house is getting cold, and I can't really afford to get a repairman right now. Thanks in advance for considering this question.
--
Alex C. in Rochester, NY
Answer
Alex,
Pilot light on ,next sequence is the flame sensor senses the pilot light and opens the main gas valve, so either your flame sensor is bad or the pilot is not strong enough (due to pilot orifice partially plugged ) or your pilot pressure is low and needs to be increased, or your pilot flame is not directly on the flame sensor.As far as the blower running it's probably on a time delay relay, which starts the fan independent of the flame, meaning with or without the flame the fan runs as long as the t-stat is calling for heat
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