Wilbur Curtis G4 Brewer Message: Over Temp. Error
Over Temp. Error means the sensor reads that the heating tank temperature has risen above the limit, or the sensor has shorted to ground. Turn the brewer off, let it cool, then reset with the rear toggle switch; the manual notes the error is disabled on CGC and Seraphim models.
High: the heating tank may be overheating, so brewing stops and the cause must be found.
- Code
- Over Temp. Error
- Maker
- Wilbur Curtis
- Equipment
- Coffee brewers
- Applies to
- G4 ThermoPro Twin (G4 Gemini family) display message
What does Wilbur Curtis Over Temp. Error mean?
The control monitors the tank temperature through a sensor, and it has an upper limit it will not allow. If the sensor says the tank is above the limit, or the sensor has shorted to ground so it reads a false high, the display shows Over Temp. Error (Excess Temperature). The manual calls it an error, and brewing stops. Its actions are to turn the brewer off and let it cool, to check for a false over-temp from the temperature sensor, to check the UPM and SSR as the troubleshooting guide directs, and to reset with the rear toggle switch. The table also notes that the error is disabled on CGC and Seraphim models. A real overheat and a shorted sensor look the same at the display, so the checks start with the sensor. The numbers in the manual table did not come through in the text we could read, so we do not quote any limits.
Affected models and control systems
Wilbur Curtis G4 ThermoPro 1.5 gallon brewers, models G4TP2T (twin) and G4TP2S (single). The manual notes this error is disabled on CGC and Seraphim models.
Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.
What you may notice
- Over Temp. Error (Excess Temperature) on the display
- Brewing stops
- Tank or housing is hot
- Message returns after a restart
Possible causes
Listed in Wilbur Curtis's documentation
- Tank temperature above limit
- Sensor shorted to ground
Other likely causes — what usually sits behind Over Temp. Error on this control. A technician confirms which one it is before any part is replaced.
- SSR (solid state relay) stuck on, heating without control
- UPM output failing
- Tank scale insulating the sensor so heat builds up
Safe checks before calling for service
- Turn the brewer off and let it cool.
- Switch the rear toggle off and then on.
- Try one brew only.
- If it returns, note how quickly it happens after switching on and call us.
How a technician diagnoses Over Temp. Error
- Read the display and confirm Over Temp. Error.
- Let the brewer cool, then check for a false over-temp from the sensor.
- Check the UPM and SSR as the guide directs.
- Compare the sensor with a reference thermometer.
- Replace the failed part.
- An SSR stuck on is a heating safety matter.
- The UPM and SSR carry line voltage.
- A sensor shorted to ground needs a meter test.
How Over Temp. Error differs from similar codes
Over Temp. Error is a high temperature reading; Sensor Error is a broken or shorted thermistor circuit.
Technical reference
- Maker documentation
- Wilbur Curtis owner support
- Edition
- F-10023; troubleshooting pages carry 122717A
- Models / control
- G4 ThermoPro Twin (G4 Gemini family) display message
- Section
- ERROR CODES, page EC1
- Checked
- October 2026
We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.
Related Wilbur Curtis coffee brewer error codes
Is the water really that hot?
It may be. A shorted sensor gives the same message.
How do I reset?
Let it cool, then use the rear toggle switch.
Does my CGC or Seraphim show it?
The manual says it is disabled on those models.
Need help with Wilbur Curtis Over Temp. Error?
A technician confirms the cause on site and gives you the price in writing before any work starts.