BoilerFaultCodesTechnical description
Room thermostat communication error – disconnection or communication loss in room thermostat.
What causes this fault?
This fault occurs when the boiler's control board can no longer 'talk' to your room thermostat, usually due to a dropped signal or a hardware failure. The most common reason is simply that the thermostat batteries have run out, but it can also be caused by a faulty wireless receiver or loose wiring between the boiler and its controls.
This fault is frequently reported during the first cold spell of autumn when homeowners try to turn their heating back on after months of inactivity, only to find the thermostat batteries have drained.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.