Heat Siphon Secondary Temperature Sensor / Coil Sensor Fault

Display shows “P2”; unit may shut down or show unstable temperature readings.

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.

Possible Causes

Failed evaporator coil temperature sensor, Damaged sensor wiring, Control board sensor input failure

Safety first: Turn off power at the breaker.

Locate coil sensor: Typically clipped to the evaporator (air) coil tubing or mounted near it.
Inspect mounting: Ensure the sensor is firmly attached to the coil and not hanging loose or insulated from the metal surface.
Check wiring: Look for pinched or broken wires and reseat the connector on the control board.
Test sensor: Measure resistance and compare to the manufacturer’s chart. Replace if out of range.

Medium 3/5

Evaporator Coil Temperature Sensor

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