Error code reference

Carrier Furnace Error Code 23

Pressure switch did not open.

First step from the service manual

Check for obstructed pressure tubing or pressure switch stuck closed.

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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M+ Max·Carrier furnace

23 on my Carrier furnace

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Pressure switch did not open

From Service Manual 102615, p.27:

1.Check for obstructed pressure tubing or pressure switch stuck closed.

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

Get the full diagnostic procedure for 23.

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