Error code reference

Carrier Hvac Error Code 46

Brownout condition

Brownout condition — secondary voltage of transformer fell below 15Vac for more than four seconds.

First step from the service manual

Check transformer secondary voltage; condition clears automatically when secondary voltage rises above 17Vac for more than four seconds.

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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Brownout condition — secondary voltage of

From Service Manual 761142, p.34:

1.Check transformer secondary voltage; condition clears automatically when secondary voltage rises above 17Vac for more than four seconds.

2.Measure line voltage at the power cord terminal block. Expected: 120 VAC (L1 to neutral) or 208 to 240 VAC between L1 and L2 under load.

3.Inspect the cord strain relief and terminal block screws for signs of arcing or heat discoloration. Loose connections here mimic an intermittent power failure to the control board.

Part W10911048

Power cord assembly

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First step from the service manual

Get the full diagnostic procedure for 46.

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