Ultima Cosa Underheating / Temperature Regulation Fault

Timer counts down but temperature never reaches the set point; food undercooked.

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

Weak heating element, Misreading temperature sensor, Control board limiting power, Door/basket seal leakage

Safety first: Unplug and cool the unit before internal checks.

Avoid overloading: Cook smaller batches to see if performance improves. Overloading can mimic underheating.
Check basket fit: Ensure the basket drawer seals well against the housing with no large gaps.
Test actual temperature: Use an oven thermometer placed in the basket to compare actual temperature to the set value. If significantly lower, inspect heater and sensor.
Inspect heater and sensor: Replace a weak heater or drifting sensor as described in related entries.

Medium 3/5

Heating Element Assembly

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