Boiler shows E20, circulation or pump fault, boiler overheats quickly.

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

Seized pump, Air lock, Blocked system, Faulty pump relay on PCB

Safety: Isolate power and allow boiler to cool.

Vent pump: Open pump vent screw (if fitted) to release air and check if shaft turns.
Free or replace pump: If seized, attempt to free shaft; otherwise replace pump.
Engineer: Check PCB pump output if pump is good but not powered.

Hard 4/5

Circulation Pump

Check Price on Amazon

We may earn a commission from links on this page.