Question about Heating & Cooling
Changed batteries in thermostat Changed Carling switch toggle fan switch Turned all breakers off and back on...
Does the fan run normally? Or does it run all the time? If the fan operation is normal the problem may be a bad heat sequencers(relays) or the heat strip itself could be defective. Kill the high voltage grab a meter and disconnect the wires from the heat strip and ohm out the winding. If it's open then that's a problem. If it has a value ( probably low that's ok) then they should be good. Plug all wires back in. Move to the the heat sequencers look for any burnt wires. The low voltage should be blue and white wires maybe brown (second stage normally). This is the part that requires live testing of the system do not attempt if u are not familiar or comfortable with high voltage...be careful. With all wire plugged back in and the panels off turn on the high voltage. With the meter check for low voltage across the heat sequencers to should read 24+ volts across the blue and white. This would indicate a on switch. if on then check for the lead that come from the high voltage to the heat sequencers red wire usually. This wire is hot always. Check between the chassis and this lead for 120 vac. If u have the switch on and high voltage present there should be high voltage on the opposite terminal check with meter. In no voltage the sequencer is bad. Hope this helps. Oh if no low voltage check tstat wire (white) and then check the tstat for correct programming if digital.. you might do that step first btw
Posted on Jan 02, 2017
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Posted on Jan 02, 2017
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