Boiler displays E25, burner output limited, may be associated with sensor calibration

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Incorrect installer settings, Corrupted configuration, Replacement PCB not configured, Sensor type mismatch

Safety first: Do not alter installer parameters unless you are qualified and have the ACV installation manual.

Power reset: Turn the boiler off and on to see if the error clears.
Check for recent work: If a PCB or sensor was recently replaced, inform the technician that configuration may be incomplete.
Professional configuration: An ACV-trained technician should enter the installer menu, verify all parameters (boiler model, gas type, sensor types), and recalibrate if required.

Hard 4/5

Main Control PCB

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