E26.2.x.x - Boiler thermal-cutout error

Product line: maxx pro

Error from surface-temperature sensor for boiler heating element,
short circuit to frame, safety thermostat (-4B8 in boiler),
MUX1: - 4B8

Possible reason for fault	Corrective action
Power supply was faulty	Switch off the appliance Re-start the appliance after 10 sec. If the error still appears, contact the responsible service partner (make a note of the message on the display)