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Error code reference

Dacor Oven Error Code U32

Upper/single oven temp sensor open probe 2

Dacor codesDacor oven codes

Upper/single oven temp sensor open probe 2 - A/D value of 0X3F0 or higher registered for 60 continuous seconds.

First step from the service manual

Verify connections at relay board. Verify probe state at probe connector. Secure connection, replace probe, or replace harness.

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

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What U32 means on a Dacor oven

The U32 error code on a Dacor oven indicates that the upper or single oven temperature sensor (probe 2) has registered an open circuit condition. Specifically, the analog-to-digital converter at the control board has read a value of 0x3F0 or higher for 60 or more continuous seconds. An A/D value this high corresponds to an extremely high resistance or a fully broken electrical path in the sensor circuit, which the control interprets as a failed or disconnected probe. The oven cannot regulate temperature without valid sensor input, so this fault halts normal operation.

The temperature sensor in question is a resistance-based probe, typically a negative temperature coefficient (NTC) or positive temperature coefficient (PTC) type, that feeds a continuously varying resistance signal to the relay board and ultimately to the A/D converter on the control board. When this resistance climbs beyond the expected range due to an open wire, a failed probe element, or a loose connector, the A/D reading exceeds the 0x3F0 threshold and the 60-second timer begins. This design prevents nuisance faults from momentary connection drops while still catching persistent failures.

Diagnosis begins at the relay board by inspecting the wiring connections between the relay board and the probe connector. A loose pin, corroded terminal, or damaged connector housing can interrupt the signal path without any visible damage to the probe itself. If connections are secure, the probe should be tested directly at its connector for continuity and correct resistance at room temperature. A completely open reading (infinite resistance) confirms probe failure. If the probe tests correctly, the wiring harness running between the probe and the relay board should be inspected for pinching, heat damage, or broken conductors.

Source: manufacturer service documentation.

Common causes of U32

  1. 01

    Loose or corroded probe connector

    Wiring / connection

    A poor connection at the probe connector on the relay board is the most common trigger for this fault. Inspecting and reseating the connector, or cleaning corroded terminals, can resolve the error without replacing any parts.

  2. 02

    Failed temperature sensor probe

    Part replacement

    The probe element itself can fail internally, resulting in an open circuit and infinite resistance across its terminals. Testing the probe with a multimeter at its connector will confirm this if no continuity is present.

  3. 03

    Damaged wiring harness

    Part replacement

    The harness connecting the temperature probe to the relay board can sustain heat damage, pinching, or broken conductors over time. Inspect the full length of the harness for visible damage, melted insulation, or breaks near stress points.

  4. 04

    Relay board connection issue

    Wiring / connection

    The connector where the probe harness terminates at the relay board may be loose or have a damaged pin. Verify that the harness is fully seated and that individual pins are not bent or retracted into the housing.

  5. 05

    Relay board fault

    Part replacement

    If the probe and harness both test correctly but the fault persists, the relay board itself may have a defective input circuit causing it to misread a valid signal as an open condition. This is the least likely cause and should only be considered after all other components are confirmed good.

See the test procedure for each cause

Frequently asked questions about U32

What does U32 mean on a Dacor oven?
U32 means the control board has detected an open circuit in the upper or single oven temperature sensor (probe 2). The A/D converter registered a value of 0x3F0 or higher for 60 consecutive seconds, indicating the sensor signal is out of range. This prevents the oven from accurately measuring and regulating temperature. The fault points to the probe itself, its wiring harness, or the connections at the relay board.
Can I fix the U32 error code myself?
A knowledgeable DIYer can attempt some steps, starting with inspecting and reseating the probe connector at the relay board. If a loose connection is the cause, this may resolve the error without any cost. However, if the probe or wiring harness needs replacement, some disassembly of the oven cavity may be required, and working near the relay board involves electrical components that should be handled with the oven fully unplugged.
Is it safe to use my Dacor oven while U32 is displayed?
No. When U32 is active, the oven cannot reliably monitor its internal temperature, which means it cannot regulate heat safely. Operating the oven in this condition risks overheating or unpredictable temperature behavior. The oven should remain off until the fault is diagnosed and the sensor circuit is restored to proper function.
Will resetting the oven clear the U32 error?
A power reset may temporarily clear the displayed code, but the fault will return within 60 seconds of the oven attempting to operate if the underlying problem has not been corrected. Because the error requires 60 continuous seconds of an out-of-range A/D reading to set, any persistent open circuit in the probe or harness will trigger it again as soon as the oven tries to read temperature.
How much does it cost to repair a U32 error on a Dacor oven?
Repair costs vary depending on the root cause. If only a connector needs reseating or cleaning, there may be no parts cost, though a service call fee typically ranges from $75 to $150. Replacing the temperature probe generally costs between $30 and $80 for the part, plus labor if a technician is involved. A new wiring harness or relay board will add to that range, with total repair costs potentially reaching $150 to $400 or more depending on which components need replacement.

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