SMEG Reversing Valve / 4-Way Valve Malfunction (Heat Pump Models)

Unit blows warm air in cooling mode or cold air in heating mode intermittently

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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

Stuck reversing valve, Faulty reversing valve coil, Low refrigerant affecting valve operation, Control signal issue from outdoor PCB

How to Fix / Troubleshooting

Safety first: Turn off power before accessing the outdoor unit. Reversing valve work involves refrigerant and must be done by licensed technicians.

  • Mode test: Switch between HEAT and COOL and listen for a distinct change in refrigerant flow noise at the outdoor unit.
  • Check coil connection: Ensure the reversing valve solenoid coil is firmly connected to the PCB.
  • Coil test: A technician can measure coil resistance and verify it is being energized in the correct mode.
  • Do not tap valve: Avoid hitting the valve body; this can damage the brazed joints.

Stuck or leaking reversing valves require professional replacement and system recharging.

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Repair Difficulty

Professional Required 5/5

Required Part

Reversing Valve Assembly
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