KBUDT4250A

What we most often repair on units like this

1. Mechanical thermostat losing calibration over time
2. Gasket gone hard or cracked and admitting warm air
3. Ice maker (where fitted) slowing or locking up with mineral scale
4. Condenser coils matted with dust, so efficiency falls
5. Start relay or run capacitor giving out on an aged sealed system

In Thermador’s Use & Care manual you will find the KBUDT4250A, a legacy built-in side-by-side with solid doors, 42 inches wide. The same manual covers a family of 42- and 48-inch relatives, including the 4260A, 4270A, 4850A and 4870A, along with panel-ready KBUIT counterparts. The final A marks the mechanical-control generation, which came before the electronic E generation seen on the KBUIT4255E and the KBUDT4865E.

On a unit this old, a thermostat that has lost calibration and a gasket that has cracked cause temperature complaints far more often than a dead compressor, and both are quick to test. Where an ice maker is fitted, mineral deposits tend to slow or lock it.

A compressor that hums or clicks but never starts frequently has a worn start relay or run capacitor, which is repaired separately from a low charge.

Key features

• 42 in. built-in side-by-side, solid doors, mechanical control era
• Use & Care manual from Thermador describes it together with relatives at 42 and 48 in. (4260A, 4270A, 4850A, 4860A, 4870A) and the panel-ready KBUIT versions
• Doors hang side by side, fresh food and freezer
• Older A generation, preceding the electronic E units such as the KBUIT4255E and KBUDT4865E