Observation:
This appliance is available with an optional external temperature probe. This is not standard in the UK. If the appliance has one of these fitted it must be turned on and set up in the boilers parameters in accordance with the manufacturers instructions in Adapt. If this fault code is displayed and there is not an external probe fitted check the settings in the boilers parameters. If the probe is found to be turned off in the boilers parameters the PCB is faulty and will need to be replaced.
