Heating, Air Conditioning, Fridge, HVAC/coleman furnace

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Question
my electric furnace has the following problem ; the heater will blow out hit when set on fan but won't kick off , won't do anything if thermostat set to automatic. have tried a new capacitor , didn't work. tried a new thermostat . didn't work. can't leave it on to run all the time on fan have to turn it off per breaker box. i do not have a heat pump. please help if you can. thanks.

Answer
Peggy,

Your heat sequencer for your electric heat elements may not be deenergizing ,you may have 24 volts ac to the sequencer when it should not. The heat sequencer also starts your blower fan.Possible your contact points on the heat relay ( sequencer )are welded together and keeping your fan and electric heat on.  Try disconnecting all your t-stat wires and mark where they go to see if problem continues. You can also disconnect the t-stat wires at the furnace instead. You should call for service, as this involves electrical troubleshooting.

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40+ years diversified experience.An HVAC/Refrigeration Self Employed Contractor since 1986. NATE Certifield. Answer questions pertaining to Residential and Commercial Air Conditioning , Warm Air Heating, Heat Pump systems.Mechanical and Electrical troubleshooting of these systems.Be as detailed as possible when describing problem.Packaged unit or split systems.No appliance questions.

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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 Residential Packaged and Split Systems Air Conditoning and Heat Pumps.Warm Air Oil , Natural and Propane Gas Heating systems.

Education/Credentials
Graduated from Private Technical School in 1975. An HVAC/Refrigeration Contractor . Have Unlimited Heating/Piping and Cooling Contractor License.Limited Sheetmetal Contractors License.NATE Certifield. York Certifield Master Heat Pump Technician 1986. Served 33 years combination Active Duty Air Force , Air Force Reserves and Air National Guard in the HVAC/Refrigeration Shop/Mechanical Shop. Troubleshooting/Installing HVAC/Refrigeration Equiptment Worldwide. Retiring in 2003 as a Senior NCO ,and a Mechanical Superintendent.

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