Error code reference

Samsung Heat Pump Error Code E125

Forbid operation due to low pressure

Forbid operation due to low pressure - low pressure sensor value below 3.1 kg/cm2G during cooling or below 2.6 kg/cm2G during heating for 3 consecutive seconds before pump down start.

First step from the service manual

Measure pressure using manifold gauge when system is stopped; compare with low pressure sensor reading via view mode or S-net.

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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E125 on my Samsung Heat Pump

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Forbid operation due to low pressure - low

From Service Manual 326059, p.31:

1.Measure pressure using manifold gauge when system is stopped; compare with low pressure sensor reading via view mode or S-net.

2.Measure drain pump winding resistance at connector J7 on the main control. Expected: 12 to 16 ohms at room temperature.

3.Back-probe the pump driver output under load. Verify the board switches the pump at 120 VAC during the drain portion of the cycle.

Part DC31-00054A

Drain pump motor

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First step from the service manual

Get the full diagnostic procedure for E125.

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