High
117 on Atag A200

Your boiler has shut down because there is too much water pressure in the system, which needs to be lowered to a safe level.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

What the manual says

Manufacturer manual

Water pressure is too high (> 3.0 bar). The boiler is taken out of operation. The installation pressure should be reduced by draining water from the heating system.

From this model's manual
Verified against the Atag A200 System installation & service manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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