York heat pump shows H2 and runs electric heat more often than normal

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 ambient thermistor, Sensor exposed to direct sun or non‑ambient location, Broken sensor wiring, Faulty control board input

Safety: Disconnect power to the outdoor unit before inspection.

Locate ambient sensor: Typically mounted near the outdoor coil inlet air path. Ensure it is shaded and in free air, not touching hot surfaces.
Inspect wiring and mounting: Repair any damaged wires and secure the sensor in the correct location.
Test sensor: Compare resistance to York's ambient sensor chart. Replace if out of spec.
Board diagnosis: If a new sensor does not clear H2, the outdoor control board may be misreading and should be evaluated by a technician.

Medium 3/5

Outdoor Ambient Temperature Sensor

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