Ideal boiler shows C2 and may not respond to thermostat commands

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

Loss of signal from wireless thermostat, Faulty wiring to wired thermostat, Incorrect control configuration, PCB control interface fault

Safety first: Isolate power before handling any wired controls.

User checks:

Wireless controls: For Ideal Halo or similar, replace batteries, ensure the receiver has power, and re-pair according to the control manual.
Programmer settings: Confirm that heating is set to ON or timed, not OFF or holiday mode.
Manual override: Some receivers have a manual override button; press it to see if the boiler responds.

If C2 persists, an engineer should test control wiring, replace faulty thermostats, or check the PCB.

Medium 3/5

Room Thermostat Receiver

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