Raypak heat pump displays Er3; unit may run fan only or shut down.

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

Open or shorted ambient sensor, Sensor mounted incorrectly, Wiring damage, Control board input failure

Safety first: Turn off power before accessing the sensor or control compartment.

Locate ambient sensor: Typically clipped near the air intake grill. Ensure it is not dangling or touching hot components.
Inspect cable: Look for UV damage, cuts, or rodent chewing. Reseat the connector at the control board.
Resistance test: Compare sensor resistance to the Raypak ambient sensor chart. Replace if readings are abnormal.
Replace sensor: Install a new Raypak ambient sensor in the correct location and secure the cable away from moving parts.

Medium 3/5

Ambient Temperature Sensor

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