F85 displayed, flow and return sensors show identical values when they should differ

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Sensors connected together, Wiring short, Sensors swapped, PCB input fault

Safety first: Disconnect power before working on wiring.

Inspect wiring harness: Look for shorts between flow and return sensor wires.
Verify connections: Ensure each sensor is connected to its own dedicated PCB input.
Test sensors individually: Disconnect one sensor at a time and check readings.
Repair or replace: Repair wiring faults or replace sensors/PCB as needed.

Warning: Do not operate the heater with known sensor wiring faults.

Medium 3/5

Return NTC Temperature Sensor

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