De Dietrich Control Interface / Thermostat Communication Issue

Water heater does not respond to thermostat or controller settings

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

Faulty De Dietrich room thermostat or remote controller, Broken communication cable, Incorrect control mode configuration, Main PCB input fault

Safety first: Turn off power before disconnecting any control cables.

Step-by-step checks:

Check batteries: If using a wireless thermostat, replace the batteries.
Verify mode: Ensure the heater is not in holiday or frost protection mode, which may limit operation.
Inspect wiring: For wired thermostats, check that the low-voltage cable is intact and firmly connected at both ends.

When to call a professional: If the heater does not respond even in manual mode, the control board may require service.

Medium 3/5

Room Thermostat / Controller

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