mypros+
Error code reference

Dacor Oven Error Code U34

Upper/single oven temp sensor open probe 3

Dacor codesDacor oven codes
Avg. service call
$285
National average. Trip fee plus diagnostic plus labor. Before parts.
MyPros+ 3-day pass
$9.95
Same diagnostic steps, on your phone. Start now.
You keep in your pocket
~$275
Even before you buy the part.
Skip the service call. Fix it yourself.
Full procedure unlocks instantly.
Get Started

What the U34 error code actually means

Your Dacor oven has detected that the temperature sensor inside the oven cavity has stopped sending a signal, which means the oven cannot accurately measure or control the cooking temperature. This is typically caused by a broken sensor, a loose wire connection, or a damaged wire between the sensor and the control board. The oven will not operate safely until this issue is diagnosed and the faulty component is repaired or replaced.

Diagnostic procedure

The full U34 procedure

Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.

MyPros+ · DiagnosticsStep 1 preview
1
First diagnostic step
Verify connections at relay board. Verify probe state at probe connector. Secure connection, replace probe, or replace harness.
Unlock with pass
Unlock with pass
Unlock with pass
More steps, wiring diagram references, and verified part numbers
Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
Unlock U34 procedure $9.95

Or subscribe: $29/month for unlimited access to all codes plus Max AI diagnostics.

Most common causes of U34

Ranked by how often they cause this code
  1. 1Failed temperature probe (open element)
  2. 2Loose or disconnected probe connector at relay board
  3. 3Damaged wiring harness
  4. 4Corroded or burned connector pins
  5. 5Faulty relay board

Most DIYers save hundreds by diagnosing before ordering parts.

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass

Questions people ask about U34

What does U34 mean on a Dacor oven?
U34 indicates that the upper or single oven temperature probe 3 has an open circuit condition. The oven's control system detected an analog-to-digital reading of 0X3F0 or higher from the probe for 60 continuous seconds, which signals that the probe circuit is broken or disconnected. The oven cannot regulate temperature safely when this code is active.
Is it safe to use my oven while the U34 error is showing?
No, it is not safe to continue using the oven with an active U34 fault. Without a working temperature probe, the oven control cannot monitor or limit the cavity temperature accurately. This can lead to uncontrolled overheating, which poses a fire risk and can damage the oven and surrounding cabinetry.
How much does it cost to repair a Dacor oven with a U34 error code?
Repair costs depend on which component has failed. A replacement temperature probe typically costs in the range of $50 to $150 for the part alone, while a new wiring harness can range from $30 to $100. If the relay board requires replacement, part costs can run from $150 to $400 or more. Adding professional labor will increase the total, generally ranging from $100 to $200 for a service call depending on your area.
Can I reset the U34 code and keep using my Dacor oven?
Resetting the oven may temporarily clear the display, but if the underlying problem with the probe circuit is not corrected, the fault will return within 60 seconds of the condition being detected again. Operating the oven without a functioning temperature sensor is not recommended because the control cannot accurately regulate heat, creating a risk of overheating.
How do I fix the U34 error on my Dacor oven?
Start by checking the probe connector at the relay board to ensure it is fully seated and free of corrosion or damage. Next, test the probe element directly at its connector for continuity. If the probe tests as open, replace the probe. If the probe tests correctly, inspect the full wiring harness for breaks or heat damage and replace it if compromised. As a last resort, the relay board itself may need replacement.

Related Dacor oven error codes

All Dacor oven codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass