Dacor Oven Error Code U33

U33 means the upper or single oven temperature sensor (probe 2) has been detected in a shorted condition. The oven's control system measures an analog-to-digital value of 0x0010 or lower from the sensor circuit, and when that low reading persists for 60 continuous seconds, the U33 code is triggered. A shorted probe returns a near-zero resistance reading, which prevents the oven from accurately monitoring cavity temperature. The fault can originate in the probe itself, the wiring harness, or a connector.

No, you should not continue using the oven with U33 active. A shorted temperature sensor means the control system cannot reliably read the oven cavity temperature, which can result in uncontrolled heating or incorrect cycle behavior. Continued operation under these conditions risks damage to the oven and could present a safety hazard. Resolve the fault before resuming normal use.

Repair cost depends on which component is at fault. A replacement temperature probe typically runs in the range of $30 to $80 for the part, while a wiring harness can range from $40 to $120 depending on the model. If the relay board requires replacement, parts alone can range from $150 to $400 or more. Adding professional labor, total repair costs generally fall between $100 and $500 depending on the diagnosis outcome and service rates in your area.

A knowledgeable DIYer can start by checking and reseating the probe harness connectors at both the relay board and the probe end, since a loose connection is a possible cause. If reconnecting does not clear the code, testing the probe's resistance with a multimeter will confirm whether the sensor has shorted internally. Probe replacement is a manageable DIY repair, but if the fault points to the relay board or a harness routed deep within the oven cavity, professional service is recommended.

A power reset may temporarily clear the display, but the code will return within 60 seconds of startup if the underlying short circuit is still present. Because the fault requires the low A/D reading to persist for a full minute before triggering, a reset only delays the reappearance. The probe, harness, and connectors must be inspected and repaired before the error will stay cleared.