What the manual says
Manufacturer manualFlow or return sensor fault. Short circuit in the flow, return or boiler temperature sensor. Defective or not (properly) connected flow, return or boiler temperature sensor.
From this model's manual
Verified against the Remeha/Remeha Avanta installation & service manual.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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All 22 fault codes on the Avanta Plus 30s system
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