Wolf CW24 Cup Warming Drawer Code Er3: Temperature Sensor Open

What Er3 means

On the Wolf CW24 cup warming drawer, code Er3 means the temperature sensor is not connected or is damaged, an open circuit. The control cannot read the drawer temperature, so it cannot warm cups reliably. The owner sees Er3 on the display and the drawer may stop heating until the sensor circuit is repaired. Cups placed inside will cool instead of staying warm.

Common causes of Er3

Temperature sensor not connected
Sensor damaged or open circuit
Loose sensor connection

✓ One safe check you can try

1. Turn the cup warmer off. 2. Let it cool and remove the cups. 3. Switch off its breaker for a minute, then restore it. 4. Turn it on again and watch for Er3. 5. If it returns, stop using it and call us.

! Why to stop there

The sensor and its connection are inside the unit, not an owner area.
Heating without a temperature reading is not reliable.
We test the sensor circuit, quote in writing before work, and give 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

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 50Wolf WWD30 Warming Drawer Code 50 (Door Switch): Closed During Operation 60Wolf WWD30 Warming Drawer Code 60: Stuck Relay and Overheating 70Wolf Warming Drawer Code 70 (Cable): Relay Link to Control Open

Er3Er3 questions

What does open circuit mean?

It means the control cannot see the sensor, either because it is unplugged inside or because the sensor is damaged. Both give Er3, and the control stops heating to stay safe.

Can I still use my cup warmer?

We suggest not. Without a sensor reading the control cannot hold the temperature properly. Use another way to warm cups until we repair it and quote the work in writing.

How is it repaired?

We check the sensor connection first, since a loose plug is the simplest cause, then the sensor itself. You get a written price before work and a 30-day workmanship warranty.