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Error code reference

Dacor Range Oven Cooktop Error Code U22

Over temperature (upper/single oven)

Dacor codesDacor range oven cooktop codes

Over temperature (upper/single oven) - one of the sensors are out of calibration or bad.

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What U22 means on a Dacor range oven cooktop

The U22 error code on Dacor ranges and ovens indicates an over-temperature condition in the upper or single oven cavity. This fault is triggered when the oven's control board detects that the temperature has exceeded safe operating limits, and it traces the root cause to one or more temperature sensors that are either out of calibration or have failed outright. The sensors involved are typically RTD (resistance temperature detector) probes or thermistors mounted inside the oven cavity, which send continuous resistance-based temperature readings to the electronic control board.

When a sensor drifts out of calibration, it can report inaccurate temperatures to the control board. If the sensor reads falsely low, the board compensates by commanding more heat, which drives the actual cavity temperature beyond its upper threshold and triggers the U22 fault. Conversely, a sensor that has partially failed may send erratic or out-of-range resistance values that the control board interprets as an over-temperature event. Either failure mode results in the same error code being displayed.

In addition to sensor issues, wiring harness problems between the sensor and the control board can cause this code. Damaged insulation, loose connectors, or corroded terminals can introduce resistance into the circuit that mimics a faulty or out-of-range sensor reading. The control board itself is a less common but possible cause if it is misinterpreting valid sensor signals. Accurate diagnosis requires measuring sensor resistance at the probe and at the board connector to isolate where the fault originates.

Source: manufacturer service documentation.

Common causes of U22

  1. 01

    Failed or out-of-calibration oven temperature sensor

    Part replacement

    The RTD or thermistor probe inside the oven cavity is the most frequent culprit. A sensor that has drifted out of its specified resistance range will cause the control board to mismanage heat output, triggering the U22 fault.

  2. 02

    Damaged or corroded sensor wiring harness

    Part replacement

    Wiring between the temperature sensor and the control board can develop breaks, burnt insulation, or corroded connectors over time. These wiring faults alter the resistance signal the board receives, producing false over-temperature readings.

  3. 03

    Loose sensor connector at the control board or sensor

    Wiring / connection

    A partially seated connector at either end of the sensor circuit can introduce intermittent resistance changes. Inspecting and reseating connectors at both the sensor terminal and the board header should be part of any early diagnostic check.

  4. 04

    Actual runaway oven temperature due to faulty relay or igniter circuit

    Part replacement

    If the heating element relay on the control board is stuck closed, or the bake or broil element is cycling incorrectly, the oven may genuinely overheat rather than just reporting a false reading. This requires checking both the sensor and the heating circuit.

  5. 05

    Faulty electronic control board

    Part replacement

    If sensor resistance values test within specification but the U22 code persists, the control board itself may be misinterpreting the sensor signal. This is the least common cause and should only be considered after sensors and wiring are ruled out.

See the test procedure for each cause

Frequently asked questions about U22

What does U22 mean on a Dacor range, oven, cooktop?
The U22 code indicates an over-temperature condition in the upper or single oven cavity. Dacor's control system has detected that the oven temperature exceeded its safe limit and has identified one or more temperature sensors as being out of calibration or faulty. The code is the oven's way of alerting you that temperature monitoring is compromised and further investigation is needed before safe operation can continue.
Can I fix the U22 error myself, or do I need a technician?
Some basic steps, such as reseating loose sensor connectors, are within reach for a confident DIYer. However, accurately diagnosing a failed RTD sensor requires measuring resistance with a multimeter and comparing the reading to specification, which takes some technical familiarity. Replacing internal oven components near high-voltage wiring is best handled by a qualified appliance technician if you are not comfortable with electrical diagnostics.
Is it safe to use my Dacor oven while the U22 code is active?
It is not recommended to continue using the oven while the U22 code is present. The fault indicates that temperature regulation may be unreliable, meaning the oven could overheat beyond safe limits without the control board being able to respond correctly. Using the oven in this condition risks damaging internal components and could pose a fire hazard.
Will resetting the oven clear the U22 error code?
Power-cycling the oven by shutting off the circuit breaker for a few minutes may temporarily clear the code, but if the underlying sensor or wiring problem is still present, the U22 error will return once the oven is used again. A reset is useful for confirming whether the fault is intermittent, but it does not repair the root cause.
How much does it cost to repair a Dacor oven showing the U22 code?
Repair costs vary depending on the diagnosis. A replacement oven temperature sensor typically costs between $20 and $80 for the part, while a new control board can range from $150 to $400 or more depending on the model. Adding a technician's labor, total repair costs generally fall between $100 and $500, with sensor replacements sitting at the lower end and control board replacements at the higher end.

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