Error code reference

Samsung Heat Pump Error Code E556

Detection of floating switch of indoor unit drain pump (1st detection)

Detection of floating switch of indoor unit drain pump (1st detection) - water level rise in drain plate due to drain pump failure or detection sensor defect.

First step from the service manual

Check if the indoor unit is cassette type; if so, check float switch resistance (should be OPEN when connector removed).

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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E556 on my Samsung Heat Pump

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Detection of floating switch of indoor unit

From Service Manual 322121, p.13:

1.Check if the indoor unit is cassette type; if so, check float switch resistance (should be OPEN when connector removed).

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 E556.

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