Wolf WWD30 Warming Drawer Code 20: Thermistor Open

What 20 means

Wolf WWD30 and WD30 warming drawers show code 20 when the thermistor reads open. The control sees a temperature above 300F from the sensor, which usually means the sensor circuit is open rather than the drawer being that hot. The owner sees 20 and the drawer will not hold a proper warming temperature. Food placed inside will not stay at a steady warm temperature.

Common causes of 20

Temperature sensor (thermistor) open circuit
Loose or broken sensor connection

✓ One safe check you can try

1. Start by pressing Power On/Off to switch the drawer off. 2. Let it sit for 15 minutes. 3. Switch the drawer breaker off for a minute and back on. 4. Turn it on again and check for code 20. 5. If it returns, stop using the drawer and call us.

! Why to stop there

The sensor and its wiring are behind the drawer panels, not an owner area.
With the sensor circuit open, the control cannot regulate heat correctly.
We test the thermistor circuit, give a written price first, and include a 30-day workmanship warranty.

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.

→Same appliance

Other Warming Drawer codes

60Wolf WWD30 Warming Drawer Code 60: Stuck Relay and Overheating 70Wolf Warming Drawer Code 70 (Cable): Relay Link to Control Open Er3Wolf CW24 Cup Warming Drawer Code Er3: Temperature Sensor Open FUSEWolf Warming Drawer FUSE Message: Beeping, Control Board Needed HOTWolf Warming Drawer HOT Message: Temperature Above Setting PFWolf Warming Drawer Code PF: Power Failure Notice 30Wolf Warming Drawer, Code 30: Thermistor Short 40Wolf WD30 Warming Drawer Code 40: Element Sensing Error During Preheat

2020 questions

Is my drawer really over 300F?

Not likely. Code 20 means the thermistor reads open, which the control reports as a very high temperature. The sensor circuit is the usual suspect, so the drawer itself is rarely that hot.

Can I keep warming food?

We do not suggest it. With the sensor open the control cannot regulate temperature well. Turn the drawer off and move the food to another warmer until we visit.

Does the sensor need replacing?

That depends on our test. A loose connection and a failed sensor give the same code, so we check first and quote the repair in writing before starting.