Siemens Infinite Switch / Power Control Failure

Electric radiant zone heats only on highest setting or cannot be controlled

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

Defective infinite switch, Stuck relay on control board, Shorted triac in electronic control, Miswired control knob

Safety first: Turn off power at the breaker before accessing controls.

Technician steps:

Remove the control panel and identify the infinite switch or electronic control for the affected zone.
Inspect for burnt contacts or melted plastic.
Test the switch according to Siemens wiring diagram; replace if it does not vary resistance or switch contacts correctly.
On electronic models, test the output relay or triac on the control board and replace the board if stuck on.

Medium 3/5

Infinite Switch

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