Air Conditioner Not Heating — fan motor

Use only checks that match the exact appliance or system and its official guide.

1. Check 1

   Read the thermostat mode labels, the outdoor-unit label, and the owner documentation from ordinary safe access; record whether the system is cooling-only, a heat pump, or paired with a separate heating source.

   Expected result: Heat mode is available, only Cool or Fan is available, the system uses auxiliary or emergency heat, or the equipment type cannot be confirmed.

   Next step: Use the confirmed equipment type and the matching branch below. If the type is unclear, provide the labels and model information to an HVAC technician instead of changing wiring or controls.

   Why this matters

   Why: A cooling-only air conditioner cannot be expected to heat. A heat-pump system can produce cooler-feeling air during defrost or may need auxiliary heat in some conditions, while an unknown system should not be forced into an assumed mode.

2. Check 2

   Set the thermostat to the documented Heat mode only if the system supports it, choose a reasonable setpoint, and observe the registers and indoor unit from normal access; check that registers are open and that the filter is not visibly blocked.

   Expected result: There is normal airflow that feels cool, weak airflow, no airflow, a dirty filter, closed registers, or an unusual control display.

   Next step: Open only an accidentally closed register and replace a filter only when the installed system's instructions allow it and the filter is safely accessible. If airflow stays weak or absent, stop and arrange HVAC service.

   Why this matters

   Why: Normal airflow with cool discharge keeps heat-pump mode, defrost, outdoor operation, refrigerant, or reversing-valve behavior in scope. Weak or absent airflow focuses on filter, register, indoor blower, control, or power issues rather than proving an outdoor fan-motor fault.

3. Check 3

   From a safe distance and without touching the unit, observe whether the outdoor fan spins when a confirmed heat-pump heating call is active; listen for normal operation without reaching through the grille or removing any panel.

   Expected result: The fan spins, the fan is still while the outdoor unit sounds active, the whole outdoor unit is silent, or heavy ice, debris, smoke, and damage are visible.

   Next step: If the fan is stopped while the unit sounds active, turn the system off at the thermostat and call an HVAC technician. Do not reach into the fan, remove the grille, chip ice, or try to start the motor.

   Why this matters

   Why: A stopped outdoor fan while the unit sounds active can let the compressor overheat and makes fan-motor or capacitor service a priority. A silent unit points first toward thermostat, power, control, or another system boundary. Light frost may occur during defrost, but heavy or persistent ice needs service.

4. Check 4

   With the system not running, inspect the filter from its normal access point and look around the outdoor unit for leaves or other loose obstructions; move only loose material that can be removed without touching the grille, fan, wiring, or cabinet.

   Expected result: The filter is visibly restricted, registers or return air are blocked, outdoor airflow is obstructed, or the airflow path is clear.

   Next step: Restore only ordinary, manufacturer-approved airflow conditions. If the filter is inaccessible, the unit is iced, or the fault remains after safe clearance, leave the system off as appropriate and request HVAC service.

   Why this matters

   Why: Restricted indoor or outdoor airflow can reduce heating performance and contribute to shutdown or ice. A clear path with continued no-heat or no-fan behavior points toward a system or component fault rather than more cleaning.

5. Check 5

   Look at the thermostat display and the visible positions of the indoor and outdoor disconnects or breakers without opening covers; note any trip, blank display, error message, or recent outage, and do not cycle a suspect power source repeatedly.

   Expected result: The thermostat is blank, one unit is silent, a protective device is visibly tripped, both units appear powered, or the device trips again after a safe normal reset.

   Next step: Follow only the equipment documentation's one-time reset guidance when there is no smoke, odor, water, heat, arcing, or visible damage. If the fault returns or the display stays blank, leave it for qualified HVAC or electrical service.

   Why this matters

   Why: Indoor and outdoor sections can have separate power paths, so one silent section can create a no-heat symptom. A repeat trip is evidence of an unresolved electrical or equipment fault, not permission to keep resetting.

6. Check 6

   Write a service note with equipment type, thermostat mode, indoor airflow, filter condition, outdoor fan behavior, ice or debris, power indications, error text, and the time the no-heating symptom began.

   Expected result: The evidence isolates a mode or airflow issue, an indoor fan issue, an outdoor fan issue, a power boundary, or remains inconclusive.

   Next step: Provide the note and safe-distance photos to a qualified HVAC technician. Keep the system off when a fan is stopped under load, ice is persistent, or any hazard is visible.

   Why this matters

   Why: The note helps an HVAC technician separate a fan-motor symptom from a heat-pump, control, refrigerant, or power problem without asking the homeowner to open the cabinet.