Bomann Thermostat / Temperature Control Failure (Mechanical or Electronic)

Freezer runs continuously and becomes excessively cold; items are rock-hard and frost builds up quickly.

Advertisements

Safety Warning

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.

Advertisements

Possible Causes

Stuck-closed mechanical thermostat (on basic models), Faulty temperature sensor reading too warm, Control board not cycling compressor off, Shorted thermostat wiring

How to Fix / Troubleshooting

Safety: Unplug the freezer before accessing the thermostat or control panel.

Procedure:

  • 1. Check setpoint: Ensure the temperature setting is not on maximum cold. Adjust to a mid-range setting and monitor for several hours.
  • 2. Mechanical thermostat models: Locate the thermostat knob and housing inside the cabinet. Remove the cover and inspect for burnt contacts or broken capillary tube. If the compressor never stops regardless of knob position, replace the thermostat.
  • 3. Electronic models: Test the cabinet NTC sensor as described for E1. A sensor reading too high will cause overcooling.
  • 4. Control board: If sensors and thermostat are good but the compressor never cycles off, the main control board relay may be stuck closed and needs replacement.
Advertisements

Repair Difficulty

Medium 3/5

Required Part

Thermostat / Temperature Control
Check Price on Amazon

We may earn a commission from links on this page.

Advertisements