E02 displayed, overheat or limit thermostat trip

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

Blocked circulation, Closed valves, Pump failure, Air in system, Faulty limit thermostat

Safety: Allow the boiler to cool fully before resetting any limit devices.

1. Check system valves: Ensure all main heating circuit valves are open.
2. Verify pump operation: Confirm the circulation pump runs when there is a heat demand.
3. Bleed air: Bleed radiators and automatic air vents.
4. Reset limit: Press the manual reset on the limit thermostat. If it trips again, find and correct the circulation issue.

Medium 3/5

Safety Temperature Limiter

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