Alarm 102

The following steps have to be performed by a qualified person as you may be exposed to electrical hazards and/or damage the product. Make sure the power supply is disconnected if required and the water supply is disconnected if required.

For the following steps you will need the following tool: Multimeter, Screw driver.

Cut the power supply of the water heater at the main electrical panel and disconnect the battery.
Dismount the heating module cover and the control board cover then check the state of the two upper relays on the control board.

Is a relay in a close state?

Yes No

NOTICE: An actual water tank overtemperature can be triggered by a failed relay rising its temperature.