Dacor Oven Error Code U24

U24 means the ambient temperature probe on the upper or single oven relay board has gone open circuit. The relay board's onboard thermistor is returning an analog-to-digital value of 0xF0 or higher, which the control reads as an open or missing signal. This is a board-level sensor fault, not a cavity temperature sensor fault. The repair typically involves inspecting wiring connections and, if needed, replacing the upper relay board.

A U24 error indicates a monitoring circuit on the relay board is not functioning properly. While this is not the same as a high-temperature runaway condition, operating the oven with a faulty relay board thermistor means a key safety and control circuit is compromised. It is best to clear the error, test the oven once, and have it serviced if the code returns before using it regularly.

Start by clearing the error code and running a basic cooking cycle to confirm whether the fault is persistent. If U24 returns, inspect the wiring harness and all connectors at the upper relay board for loose connections, corrosion, or damaged wires. If the wiring is intact and the error continues, the upper relay board needs to be replaced. This repair typically requires disassembling the oven's rear or control panel area and should be performed by a qualified technician.

You can clear the error and attempt to run a basic cooking mode to see if it returns. If U24 reappears, the underlying fault with the relay board thermistor has not been resolved and the oven should not be used until it is repaired. Continued use without addressing the fault may prevent the oven from operating correctly or cause additional errors.

If the fix requires only reconnecting a loose wiring harness or cleaning corroded terminals, the cost is minimal and often just labor time. If the upper relay board needs to be replaced, parts alone typically range from around $150 to $350 or more depending on the model, with professional labor adding to the total. Getting a diagnosis from a qualified technician before ordering parts is recommended.