Weishaupt Control signal interruption

Thermostat calls for heat but burner does not start, controller shows no fault

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 room thermostat, Broken thermostat wiring, Incorrect controller configuration, Open safety interlock not indicated as error

Safety: Low-voltage thermostat circuits are generally safe, but always turn off power before working on wiring.

Steps:

Verify thermostat: Increase the setpoint and ensure the thermostat display indicates a call for heat.
Bypass test (qualified): Temporarily bridge the thermostat terminals at the WCM or junction box to see if the burner starts. If it does, the thermostat or its wiring is faulty.
Configuration: Check that the correct operating mode and schedules are set on the WCM controller.

Medium 3/5

Room Thermostat

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