H00.81 Medium

Remeha H00.81 Fault Code

Also written as H0081 — same fault.

The Remeha H00.81 fault code means: your boiler has lost its connection to its external room temperature sensor, meaning it does not know the room temperature and cannot heat your home appropriately.. It appears on 1 Remeha model in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: RoomTempMissing
Typical repair cost £120-£200 (including labour)

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 H00.81 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Remeha H00.81 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