Emergency
117 on Atag iC28

Your boiler has shut down because there is too much water pressure in the system, which puts unnecessary stress on the internal components.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Act immediately

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

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.

Community-sourced, unverified
We could not tie this code to a specific manual. Treat it as indicative only.
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 emergency severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Related fault codes

118View →110View →111View →

All 18 fault codes on the iC28

Seeing a different code? Every code this model can display, in one place.

102040506178105110111118119129133151154180181

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