Thermador KBUDT4250A
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.
Look at width and the final letter on the data plate: the A on the KBUDT4250A means an older mechanical-control generation at 42 inches, while the KBUDT4865E is the newer electronic one at 48 inches.
Mechanical thermostats drift over many years, so a mismatch is a plausible, repairable cause. Measure with a separate thermometer before suspecting the compressor. The old dial is only a guide.
Dust on the condenser makes the sealed system work harder and cuts efficiency. Cleaning is an inexpensive step before judging an older compressor. It also keeps the compressor cooler.
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