Error code reference

Merloni Oven Error Code ER05

Oven PTC temperature sensor is in open circuit.

First step from the service manual

Verify functioning of PTC (ambient temp should read 545 ohm), then replace if necessary.

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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ER05 on my Merloni Oven

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Oven PTC temperature sensor is in open circuit

From Service Manual 634202, p.14:

1.Verify functioning of PTC (ambient temp should read 545 ohm), then replace if necessary.

2.Disconnect the sensor and measure resistance at the sensor body. Expected: 10 kΩ to 12 kΩ at 77°F (25°C).

3.Check the sensor harness for opens and shorts. Back-probe the sensor pins at the control board connector; a reading outside 5 kΩ to 50 kΩ indicates a failed sensor.

Part WP8577274

Temperature thermistor

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First step from the service manual

Get the full diagnostic procedure for ER05.

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