P2 displayed, furnace output limited, may not reach set temperature

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

Closed thermostatic radiator valves, Blocked or undersized pipework, Airlocks in system, Faulty flow sensor or switch

Safety first: Turn off power before opening any hydraulic components.

1. Open circuits: Ensure enough radiators or underfloor heating loops are open to provide adequate flow.
2. Bleed system: Bleed radiators and high points to remove airlocks that can restrict flow.
3. Check flow sensor/switch: On models with a flow sensor or differential pressure switch, inspect wiring and clean the sensor if accessible. Replace if faulty.
4. Pump and filter: Verify pump operation and clean any system filters to improve circulation.

Medium 3/5

Flow Sensor / Flow Switch

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