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Error code reference

Dacor Range Oven Cooktop Error Code U24

Over temperature (upper/single oven)

Dacor codesDacor range oven cooktop codes

Over temperature (upper/single oven) - ambient temp probe on relay board is open.

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What U24 means on a Dacor range oven cooktop

The U24 error code on a Dacor range or oven indicates an over-temperature condition in the upper or single oven cavity, specifically caused by an open circuit in the ambient temperature probe located on the relay board. The relay board contains a small thermistor-style probe that continuously monitors the internal ambient temperature surrounding the board itself. When this probe circuit goes open, the control detects an invalid or missing signal and interprets it as an extreme over-temperature event, triggering the U24 fault to protect the appliance from potential thermal damage.

The relay board ambient probe is a critical safety component. An open circuit in this probe typically means the probe element itself has failed internally, the wiring harness connecting the probe to the relay board has a break or disconnected terminal, or a connector has corroded or pulled loose. In some cases, excessive heat buildup inside the oven cavity or control compartment can physically damage the probe or its wiring, causing an open condition. The relay board itself can also be the source of the fault if the probe input circuit on the board has failed.

Diagnosing U24 requires inspecting the relay board and its associated wiring. A technician should check the probe connector for secure seating, then use a multimeter to measure continuity and resistance across the ambient probe. An open reading, showing no continuity, confirms the probe has failed. If the probe measures within normal range, the wiring harness and the relay board input circuit should be evaluated. Replacing the faulty component, whether the probe, the harness, or the relay board, will resolve the error.

Source: manufacturer service documentation.

Common causes of U24

  1. 01

    Failed ambient temperature probe

    Part replacement

    The ambient probe on the relay board has developed an open circuit internally, meaning it no longer conducts. A multimeter check across the probe terminals will show no continuity, confirming the probe has failed and needs replacement.

  2. 02

    Loose or disconnected probe connector

    Wiring / connection

    The connector linking the ambient probe to the relay board may have vibrated loose or pulled free from its socket. Inspect the connector at the relay board for proper seating and any signs of backing-out terminals.

  3. 03

    Damaged probe wiring harness

    Part replacement

    The wiring between the ambient probe and the relay board may have a break, pinch, or burn that interrupts the circuit. Visually trace the harness for damage and use a multimeter to check continuity along each wire.

  4. 04

    Corroded or heat-damaged connector terminals

    Part replacement

    High heat exposure in the control compartment can corrode or oxidize the probe connector terminals, increasing resistance to the point of an open circuit. Inspect terminals for discoloration, pitting, or residue that could indicate heat or corrosion damage.

  5. 05

    Faulty relay board

    Part replacement

    If the ambient probe and its wiring both test good, the input circuit on the relay board itself may have failed, preventing the control from reading a valid probe signal. This requires relay board replacement.

See the test procedure for each cause

Frequently asked questions about U24

What does U24 mean on a Dacor range, oven, cooktop?
U24 indicates an over-temperature fault caused by an open circuit in the ambient temperature probe on the relay board of the upper or single oven. The probe monitors the temperature around the control board, and when its circuit goes open, the control cannot get a valid reading and shuts down to prevent damage. This is a component-level fault that requires inspection of the probe, wiring harness, and relay board.
Can I fix a U24 error on my Dacor oven myself?
A knowledgeable DIYer can inspect the relay board area for obvious wiring issues like a disconnected connector, which may resolve the fault without replacing parts. However, testing the ambient probe with a multimeter and replacing the probe or relay board requires comfort working with oven control components and disconnecting power safely. If you are not confident with electrical diagnostics, a qualified technician is recommended.
Is it safe to use my Dacor oven while the U24 code is active?
No, you should not attempt to operate the oven while U24 is active. The fault means the relay board ambient probe circuit is open, and the oven's control system cannot properly monitor temperature conditions in the control area. Operating the oven in this state could risk undetected overheating. The appliance should be left off until the fault is diagnosed and repaired.
Will resetting the oven clear the U24 error code?
A power reset by turning off the circuit breaker for 30 to 60 seconds may temporarily clear the error code, but it will return as soon as the control reads the open probe circuit again. The underlying cause, whether a failed probe, broken wiring, or a faulty relay board, must be corrected for the error to be permanently resolved.
How much does it cost to repair a Dacor U24 error code?
Repair costs vary depending on which component has failed. If only the ambient probe or its wiring connector needs replacement, costs are typically on the lower end of the repair spectrum. If the full relay board requires replacement, parts and labor costs are considerably higher, often ranging from $200 to $500 or more depending on the specific model and local labor rates. Getting a diagnostic assessment from a technician before committing to parts is advisable.

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