16-17 Emergency

Remeha 16-17 Fault Code

Also written as 1617 — same fault.

The Remeha 16-17 fault code means: your boiler has detected that dangerous exhaust fumes are being blown back into the appliance instead of exiting through the flue safely.. It appears on 3 Remeha models in our database.

Act immediately

Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now. This fault can be dangerous if ignored.

Technical description: Down draught thermostat

What causes the Remeha 16-17 fault?

This fault occurs when the safety sensors detect that combustion gases are being pushed back down the chimney instead of escaping outside. The most common reason is an external blockage in the flue or high winds blowing directly into the terminal, preventing the boiler from venting safely.

This fault is more common during periods of extreme high winds or stormy weather, which can create a back-pressure in the flue system.

Typical repair cost £120-350 (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 16-17 fault code

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

Source

Remeha 16-17 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 27 April 2026