F4
Reliance Heat Pump Fan Motor Fault

Reliance hybrid water heater displays F4 and fan may not run

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Failed evaporator fan motor, Obstructed fan blades, Faulty fan capacitor (if used), Loose fan wiring

How to Fix / Troubleshooting

Safety first: Turn OFF power at the breaker. Keep fingers and tools clear of fan blades when testing.

Steps to check:

  • 1. Inspect fan area: Remove the top cover and check for debris, insulation, or wiring contacting the fan blades. Clear any obstructions.
  • 2. Spin fan by hand: The fan should rotate freely. If stiff or seized, the motor likely needs replacement.
  • 3. Check wiring and capacitor: Inspect the fan motor harness and any external capacitor. Look for burned terminals or bulging capacitors. Replace a visibly damaged capacitor with the correct rating.
  • 4. Test operation: Restore power briefly and call for heat pump mode while observing the fan. If it hums but does not start, suspect a bad capacitor or motor.
  • 5. Replace fan motor: Disconnect power, remove mounting screws, and install a new Reliance fan motor assembly. Ensure correct rotation and secure all wiring.

Note: Operating the heat pump without proper airflow can cause compressor damage.

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Repair Difficulty

Medium 3/5

Required Part

Evaporator Fan Motor
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