Heat Controller Comfort-Aire BD-81

Questions and Answers

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Casey WoodsJul 30, 2025
Why is my Heat Controller Air Conditioner running but not cooling?
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  David SimmonsJul 30, 2025
  If your Heat Controller Air Conditioner is running but not cooling effectively, several factors could be the cause. First, ensure that cold air circulation is smooth. Check the outdoor coil (heat exchanger) and its fan operation. Also, review if there's been an increase in heat load. Other potential issues include gas leakage (repair the leak if found), incorrect inside gas pressure, or clogging in the refrigeration circuit (repair any clogging in the inlet and outlet). Adjusting the refrigerant charge may also help. If the unit is beyond repair or the compressor is faulty, replacement of either the compressor or the entire unit might be necessary. Ensure that the auto air-swing is off.
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Kathleen LongAug 5, 2025
What to do if my Heat Controller Comfort-Aire BD-81 Air Conditioner fails to start?
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  liuphillipAug 5, 2025
  If your Heat Controller Air Conditioner fails to start, begin by checking the power source, circuit breaker, and fuse. Inspect the control switch and capacitor. If any of these components are faulty, consider replacement of the capacitor, fan motor, or compressor.
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Kelsey LeeAug 20, 2025
How to reduce fan motor noise in my Heat Controller Air Conditioner?
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  Anne WarrenAug 20, 2025
  To address fan motor noise in your Heat Controller Air Conditioner: * Check the grommets and replace them if they are worn or missing. * If the fan or turbo fan is cracked, out of balance, or partially missing, replace it. * Tighten any loose set screws. * If knocking sounds continue when running, or the bearings are loose, replace the motor. Also, replace the motor if it hums or the noise appears internal while running.
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cherylwongAug 25, 2025
What to do if Heat Controller Comfort-Aire BD-81 Air Conditioner fan motor runs intermittently?
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  David PeckAug 25, 2025
  If the fan motor in your Heat Controller Air Conditioner runs intermittently, check the voltage against the limits specified on page 27. If it's not within those limits, call an electrician. Also, test the capacitor and check the bearings. Ensure the fan blade rotates freely; if not, replace the fan motor. Pay attention to any change from high speed to low speed; if the speed does not change, replace the motor.
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Angela WilliamsonNov 8, 2025
Why won't the compressor run on my Heat Controller Air Conditioner, but the fan motor does?
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  Danielle GonzalezNov 8, 2025
  If the compressor in your Heat Controller Air Conditioner isn't running while the fan motor is, check the voltage against the specified limits. Inspect the wiring connections for looseness or incorrect placement, consulting the wiring diagram for proper identification. Verify the rotary switch continuity using the wiring diagram and replace if the circuit is open. Ensure the thermostat knob is at the coldest setting and test the thermostat's continuity, replacing it if the circuit is open. Examine the capacitor, replacing it if it's outside ±10% of the manufacturer's rating or if it's shorted, open, or damaged. Finally, check the compressor itself for open circuits or grounding, replacing it if necessary. If the compressor has an externally mounted overload, check and replace if open (cool...
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mmcgrathNov 13, 2025
How to fix a Heat Controller Comfort-Aire BD-81 Air Conditioner fan motor that won't run?
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  Bruce JohnstonNov 13, 2025
  If the fan motor on your Heat Controller Air Conditioner won't run, start by checking the voltage at the outlet. If there's no voltage, correct the issue. Then, check the voltage to the rotary switch; if there's none, inspect the power supply cord and replace it if the circuit is open. Check the rotary switch continuity, referring to the wiring diagram for terminal identification, and replace the switch if it's defective. Ensure all wires are connected and terminals are secure, using the wiring diagram for reference; repair or replace loose terminals. Test the capacitor (after discharging it) and replace it if it's not within ±10% of the manufacturer's rating or if it's shorted, open, or damaged. If the fan blade is hitting the shroud or the blower wheel is hitting the scroll, realign the ...