Boiler intermittently shows C1 286, often during heating demand.

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 running at incorrect speed, Partially blocked system, Air in pump, Faulty pump electronics

Safety first: Turn off power before touching the pump or pipework.

Bleed pump (if bleed screw fitted): Some pumps have a central screw that can be loosened slightly to release trapped air (have a cloth ready). Only do this if you are confident and the system is cool.
Check system pressure: Maintain 1.0–1.5 bar cold.
Engineer tasks: An engineer should check pump speed settings, verify flow rates, clean filters, and replace the pump if its electronics are faulty.

Hard 4/5

Circulation Pump

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