Main Heating · Eco Compact System 15–18

125 boiler fault code

Main Eco Compact System models 15–18

What 125 means

Circulation fault (primary).

Find a Gas Safe engineer

A boiler fault code alone is not a gas or carbon-monoxide emergency. If you smell gas, a CO alarm sounds, or someone has possible carbon-monoxide symptoms, leave and call 0800 111 999 from outside.

Safe check: Note the code shown on the display. Do not open, adjust or repeatedly reset the boiler. Contact a Gas Safe registered engineer.

Gas Safe registered engineer: Note the code shown on the display. Do not open, adjust or repeatedly reset the boiler. Contact a Gas Safe registered engineer.

Official source: Main Eco Compact System 15–18 User Guide 7716579-02 · §7.1.1 List of error codes, Table 8, code 125, printed p. 21