Wolf M Series Code 2420: Relay board RTD circuit

What 2420 means

On Wolf M Series wall ovens, 2420 means the relay board detected a problem in the RTD temperature circuit. The RTD is the probe that tells the control the oven temperature. The code is not tied to one cavity. You see 2420 on the display and the oven may not heat or hold temperature properly. The control protects itself by refusing to heat without a trusted reading.

Common causes of 2420

The RTD circuit is reading out of range on the relay board
A loose or damaged connector at the RTD wiring
The relay board input needs replacement

✓ One safe check you can try

1. Cancel cooking and allow the cavity to cool. 2. Unplug any temperature probe from the oven and try again. 3. Reset power at the breaker for about a minute. 4. A repeat code needs a technician with a meter.

! Why to stop there

Sensor readings drive safety limits, and an unreliable one is not something to work around.
On this code the cause may also be a loose or damaged connector at the RTD wiring, or the relay board input needs replacement, so we rule each out before we quote.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

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Other Wall Oven codes

0121Wolf M Series Oven Code 0121: upper right convection relay shorted 0221Wolf M Series Code 0221: Upper Bake Element DLB Shorted 0321Wolf M Series Oven Code 0321: Broil Relay Shorted on the Upper Element 0421Wolf M Series Code 0421: upper left convection relay shorted 0630Wolf M Series Oven Code 0630: Auxiliary DLB Shorted 1620Wolf M Series Code 1620: Auxiliary DLB open 3311Wolf M Series Code 3311: Upper thermal cutoff open 1831Wolf M Series Code 1831: Upper door lock relay open

24202420 questions

Is 2420 about a bad probe or a bad board?

The code names the relay board's RTD circuit, so it can be either the sensor path or the board input. A technician measures the circuit to tell which, so you do not buy the wrong part. We quote the price first.

Will food burn if I keep cooking?

It might. The control may misjudge heat or shut off without warning. Use a separate oven thermometer if you must cook, and keep it brief. We recommend booking the sensor check first.

What does the visit include?

The technician reads the logged code, measures the sensor circuit, finds whether the part or the board has failed, and writes the price down for your approval. Our 30-day workmanship warranty applies.