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Error code reference

Dacor Oven Error Code U22

Upper/single oven over temperature

Dacor codesDacor oven codes

Upper/single oven over temperature - probe 1 and probe 2 temperature amplifier failure; probes cannot be more than 50°F apart when oven is between 75°F and 100°F on the rise.

First step from the service manual

Verify probe cables are connected properly. Verify temperature probes are reading correctly using A/D screen in SERVICE DIAGNOSTICS. Replace temperature probe if needed.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What U22 means on a Dacor oven

The U22 error code on a Dacor upper or single oven indicates a temperature amplifier failure involving both probe 1 and probe 2. Specifically, the control has detected that the two temperature probes are reading more than 50°F apart from each other while the oven temperature is in the 75°F to 100°F rise window. During this early heating phase, both probes should be tracking closely together. A spread exceeding 50°F signals that at least one probe is sending an inaccurate signal, which the control interprets as a temperature amplifier fault.

The probes involved are the internal oven temperature sensors responsible for feeding analog temperature data to the control board, where it is converted via an analog-to-digital (A/D) converter. When one probe reads significantly higher or lower than the other during the monitored rise phase, the control cannot determine which reading is accurate, so it flags the amplifier circuit as failed and triggers U22. This protects against potential overheating conditions caused by a runaway or misleading sensor signal.

Common root causes include loose or damaged probe cable connections at the control board or probe terminals, a failed or drifting temperature probe, and in less common cases, a fault in the A/D conversion circuit on the control board itself. Dacor's diagnostic approach begins with physically verifying the cable connections for both probes and then using the A/D screen in SERVICE DIAGNOSTICS mode to read live probe values and identify which sensor is out of range.

Source: manufacturer service documentation.

Common causes of U22

  1. 01

    Loose or disconnected probe cable

    Wiring / connection

    A probe cable that is not fully seated at the control board or probe connector can cause erratic or absent readings. Inspect both probe cable connections and reseat them firmly before further diagnosis.

  2. 02

    Failed temperature probe

    Part replacement

    One of the two temperature probes may have drifted out of calibration or failed entirely, producing a reading that deviates more than 50°F from the other probe during the heating rise. The A/D screen in SERVICE DIAGNOSTICS can confirm which probe is reading incorrectly.

  3. 03

    Damaged probe cable or wiring

    Part replacement

    Physical damage such as pinching, burning, or fraying along the probe cable can introduce resistance that skews the sensor signal. Inspect the full length of both probe cables for visible damage.

  4. 04

    Probe connector corrosion or contamination

    Wiring / connection

    Moisture or grease contamination at the probe connector terminals can increase contact resistance and alter the signal reaching the control board. Clean connector terminals and inspect for corrosion.

  5. 05

    Control board A/D circuit fault

    Part replacement

    If both probe cables and probes test correctly but the U22 error persists, the analog-to-digital conversion circuit on the control board itself may be faulty, causing misreading of one or both probe signals.

See the test procedure for each cause

Frequently asked questions about U22

What does U22 mean on a Dacor oven?
U22 indicates a temperature amplifier failure involving both internal temperature probes in the upper or single oven cavity. The control has detected that probe 1 and probe 2 are reading more than 50°F apart while the oven temperature is rising through the 75°F to 100°F range. This discrepancy signals an unreliable sensor reading, so the oven stops normal operation to prevent a potential overtemperature condition.
Can I fix a U22 error on my Dacor oven myself?
A knowledgeable DIYer can start by checking that both probe cables are firmly connected at the control board and probe ends. If the connections are secure and the error persists, diagnosing the fault further requires accessing the SERVICE DIAGNOSTICS A/D screen to compare live probe readings. Replacing a temperature probe is a manageable repair for someone comfortable working inside the oven cavity, but a control board replacement should be handled by a qualified technician.
Is it safe to use my Dacor oven while it shows a U22 error?
It is not recommended to continue using the oven while U22 is active. The error means the control cannot reliably determine the actual oven temperature, which creates a risk of overheating. The oven should remain off until the faulty probe or connection is identified and corrected.
Will resetting my Dacor oven clear the U22 error?
A power reset may temporarily clear the U22 code, but the error will return if the underlying cause is not addressed. If the probe cables are loose, reseating them may resolve the fault permanently. However, a failed probe or damaged wiring will continue to trigger U22 whenever the oven attempts to heat through the monitored temperature rise window.
How much does it cost to repair a U22 error on a Dacor oven?
Repair costs vary depending on the root cause. A replacement temperature probe typically costs between $30 and $80 for the part, plus labor if a technician is involved. If the control board requires replacement, parts and labor combined can range from $250 to $600 or more. Getting a diagnostic inspection first helps avoid replacing parts unnecessarily.

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