Service Mode Reference

Service Mode Reference

Pick a manufacturer. Each model shows how to enter MAX/MIN test mode, the CO₂/CO/ratio targets, and whether the gas valve can be adjusted.

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⚠ Reference data only — always verify on the appliance. Targets and procedures are extracted from manufacturer commissioning manuals. They are a quick-reference aid, not a substitute for the I&S manual. Always check the boiler data plate, work to current Gas Safe / Building Regulations requirements, and refer to the original manufacturer manual for definitive figures. Gas Safe registered engineers only.