Boiler displays E02, overheat or safety thermostat intervention.

Restore circulation: Check pump, bleed system, open valves.
Engineer check: Inspect heat exchanger and overheat stat if E02 recurs.

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

Pump failure, Blocked heat exchanger, Air in system, Closed valves

Safety: Let the boiler cool. Do not bypass safety devices.

Hard 4/5

Primary Heat Exchanger

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