Heating, Air Conditioning, Fridge, HVAC/Central Heat and Air fan

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Question
I have a Goodman ARUF303016BA UNIT. The fan runs all the time. the unit does not shut off during heating or cooling when proper room temp is reached.

replacing thermostat did not solve problem.

Is there a way to test the fan blower control board or should I just replace it?

Is there something else I should check first?

Answer
Robert,

Goodman uses time on and time off for the fan relay. First verify that there is no 24 volt ac at the fan relay COIL.if there is not, chances are the relay points are not opening up to turn off the blower.You can buy a standard relay with 24 volt coil and a couple normally open and closed set of contacts.A rbm relay cost less than $30.00. You can also pull the blower motor wires off the time delay relay while power is off and ohm out the contacts.If the contacts read closed they probably welded shut.with no power to the relay the contacts are suppose to be open.If this is a heat pump with electric heat one of your heat sequencer relay fan contacts
May be welded shut. Look at wiring diagram inside air handler to see how the blower motor is hooked up to.Basically how the fan relay works.  

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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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