Error code reference

Carrier Hvac Error Code 25

Invalid motor/model selection

Invalid motor/model selection — motor size is incorrect for fan coil size or fan coil size data is invalid.

First step from the service manual

If model size data is missing, User Interface will prompt installer to enter correct model size; if motor size is incorrect, replace motor with proper size.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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Step-by-step tests with expected resistance, voltage, and continuity values
Wiring diagram references and connector pinouts from the OEM service manual
Verified part numbers when replacement is required

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Invalid motor/model selection — motor size is

From Service Manual 761205, p.17:

1.If model size data is missing, User Interface will prompt installer to enter correct model size; if motor size is incorrect, replace motor with proper size.

2.Measure door lock assembly resistance across the PTC terminals. Expected: ~200 ohms cold, rising sharply once energized.

3.Inspect strike and latch alignment. A warped door or misaligned strike prevents the switch stack from closing in the correct sequence.

Part W10810403

Door lock assembly

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First step from the service manual

Get the full diagnostic procedure for 25.

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