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Error code reference

Dacor Range Oven Cooktop Error Code U30

Temp sensor (upper/single oven)

Dacor codesDacor range oven cooktop codes

Temp sensor (upper/single oven) - open RTD 1, check wiring at connection points.

First step from the service manual

Check wiring at connection points.

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

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What U30 means on a Dacor range oven cooktop

The U30 error code on a Dacor range or oven indicates an open circuit condition in RTD 1, the resistance temperature detector assigned to the upper oven or single oven cavity. An RTD is a temperature-sensing element whose electrical resistance changes predictably with temperature. When the oven control detects that the RTD circuit is open, meaning no measurable resistance is present, it cannot determine the cavity temperature and triggers the U30 fault to prevent unsafe operation.

An open RTD circuit means the electrical path through the sensor has been completely broken. This can occur at the sensor element itself if the internal resistance wire has failed, or it can occur anywhere along the wiring that connects the sensor to the oven control board. Connectors that have corroded, pulled apart, or suffered heat damage are a frequent source of this type of fault. The first diagnostic step is a thorough inspection of all wiring and connection points in the RTD 1 circuit before condemning the sensor itself.

Because the sensor is located inside the oven cavity and the wiring runs through areas exposed to repeated thermal cycling, physical damage and connector degradation are common over time. A technician should inspect the sensor leads where they exit the oven cavity, trace the wiring harness for any signs of chafing or melting, and check each connector for corrosion or backed-out terminals. If wiring and connections check out, resistance testing of the RTD element itself will confirm whether the sensor has failed internally.

Source: manufacturer service documentation.

Common causes of U30

  1. 01

    Loose or disconnected wiring connector

    Wiring / connection

    The connector at the RTD sensor or at the control board may have worked loose due to vibration or repeated thermal expansion and contraction. Inspect and reseat all connectors in the RTD 1 circuit as the first step.

  2. 02

    Corroded or damaged connector terminals

    Part replacement

    Heat and moisture can cause connector terminals to corrode or develop high resistance, eventually breaking the circuit entirely. Look for discoloration, pitting, or greenish deposits at each connector in the sensor wiring path.

  3. 03

    Chafed or broken wiring harness

    Part replacement

    The wiring between the RTD sensor and the control board passes through areas subject to heat and movement. A wire that has chafed through its insulation and broken, or been pinched during a previous repair, will produce an open circuit condition.

  4. 04

    Failed RTD temperature sensor

    Part replacement

    The internal resistance element of the RTD sensor can fail open after prolonged use, especially if the oven has been overheated. Confirm this by disconnecting the sensor and measuring its resistance with a multimeter. An open reading with good wiring indicates a failed sensor.

  5. 05

    Faulty oven control board

    Part replacement

    If wiring, connectors, and the RTD sensor all test correctly, the control board's sensor input circuit may have failed and is incorrectly reporting an open condition. This is the least common cause and should only be considered after all other components are ruled out.

See the test procedure for each cause

Frequently asked questions about U30

What does U30 mean on a Dacor range, oven, cooktop?
U30 indicates that the oven control has detected an open circuit in RTD 1, the temperature sensor for the upper or single oven cavity. The control cannot read the oven temperature and has disabled operation as a safety measure. The fault points to a problem in the sensor itself or in the wiring and connectors that connect it to the control board. Inspecting all connection points in the RTD 1 circuit is the correct first step.
Can I fix the U30 error code myself?
Some causes of U30, such as a loose connector, can be resolved without replacing parts if you are comfortable working around oven wiring with the appliance unplugged. Tracing the RTD wiring, reseating connectors, and visually inspecting for damaged wires are tasks a knowledgeable DIYer can attempt. If the sensor itself has failed internally, replacing the RTD requires sourcing the correct part for your specific Dacor model. More complex repairs involving the control board should be handled by a qualified technician.
Is it safe to use my Dacor oven when U30 is displayed?
No, the oven should not be used while U30 is active. Without a functioning temperature sensor, the control board cannot regulate oven temperature accurately, which creates a risk of overheating. Discontinue use until the fault is diagnosed and repaired.
Will resetting the oven clear the U30 error code?
A power reset by unplugging the oven or tripping the circuit breaker may temporarily clear the U30 code, but it will return immediately or during the next use if the underlying wiring or sensor problem has not been corrected. The fault must be diagnosed and repaired at the source to permanently resolve the error.
How much does it cost to repair a U30 error on a Dacor oven?
Repair costs vary depending on the root cause. If only a connector needs to be reseated or a short wire section replaced, costs can be minimal. A replacement RTD temperature sensor typically runs in the range of $30 to $100 or more for parts alone, depending on the model. If the control board requires replacement, parts and labor costs can range from $200 to $500 or higher. Getting a diagnostic visit from a qualified technician will provide a more accurate estimate for your specific situation.

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