BoilerFaultCodesRemeha 37 Fault Code
The Remeha 37 fault code means: your boiler has stopped working because it cannot correctly measure the temperature of the water returning to the unit.. It appears on 6 Remeha models in our database.
Technical description: Return temperature sensor failed
What causes the Remeha 37 fault?
This fault occurs when the internal electronic sensor responsible for monitoring the water coming back into the boiler becomes damaged or loses its connection. Over time, heat stress or moisture can cause the sensor to degrade, preventing it from sending a reliable signal to the main control board. Without this vital temperature data, the boiler shuts down as a safety precaution to prevent internal overheating.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Remeha models that show the 37 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Remeha 37 fault code information on this page is sourced and cross-checked against the official Remeha service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026