Boiler displays E23, may shut down or limit output; sometimes associated with sensor wiring damage.

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

Damaged sensor cable shorting to chassis, Water ingress into connectors, Crushed harness, PCB low-voltage fault

Safety: Turn off power and do not operate the boiler until the short is located and repaired.

Inspect wiring harness: Look for pinched or melted cables, especially near sharp metal edges or hot components.
Check for leaks: Any leak dripping onto wiring or the PCB can cause shorts. Repair leaks first.
Dry connectors: If moisture is present, carefully dry connectors and apply appropriate contact protection.
Professional testing: A technician should use a multimeter to locate the shorted circuit and replace damaged wiring or PCB.

Hard 4/5

Wiring Harness

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