Error code reference

Carrier Air Conditioner Error Code 3

Short Cycling

Carrier codes Carrier air conditioner codes

Short Cycling — Compressor is running only briefly (four consecutive cycles of less than three minutes each).

First step from the service manual

Check for loose connection between thermostat Y1 and CADM Y terminal; check if unit is short-cycling on thermostat; check if system or control board is defective.

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
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Short Cycling — Compressor is running only

From Service Manual 985637, p.49:

1.Check for loose connection between thermostat Y1 and CADM Y terminal; check if unit is short-cycling on thermostat; check if system or control board is defective.

2.Measure control board supply voltage at the test points. Expected: 12 VDC and 5 VDC; a drop below 4.75 VDC on the logic rail points to a failed onboard regulator.

3.Inspect all connectors on the main control for corrosion, thermal stress, or backed-out pins. Reseat each connector with the power disconnected.

Part WPW10804018

Electronic control board

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First step from the service manual

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