Bunn Temp Sensor Out Of Range, Check For Bad Connections Error Code

What does Bunn Temp Sensor Out Of Range, Check For Bad Connections mean?

On AXIOM digital brewers, this diagnostic message means the temperature sensor probe is reading open. The control board has lost a valid temperature signal, typically because the sensor or one of its connections is broken. The manual pairs this message with the instruction to check for bad connections, pointing to an open temperature-sensor probe rather than a shorted one.

Symptoms

• Display reads "Temp Sensor Out Of Range, Check For Bad Connections"
• Brewer cannot read tank temperature
• Brewer will not reach ready or brew normally
• No valid temperature shown on the display

Common causes

• Temperature sensor probe open (failed)
• Bad or loose connection in the sensor wiring
• Disconnected sensor lead at the control board

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Diagnostic steps

1. Inspect the sensor connections

   Check the temperature sensor wiring and connectors for loose, corroded, or disconnected terminals. The manual specifically calls out checking for bad connections on this message.

2. Confirm the probe is open

   An open probe is the documented cause. Verify the temperature sensor probe is reading open rather than shorted, which is a different message.

3. Replace or repair the temperature sensor

   If the probe is open and connections are good, replace or repair the temperature sensor probe as needed.

4. Re-test after repair

   Restore the connection or fit a new probe, then power up and confirm the display reads a valid temperature and reaches ready.

When to call a professional

Reaching the temperature sensor means working inside a brewer that is heated at all times and carries live line voltage on nearby components. The manual restricts inspection, testing, and repair of electrical equipment to qualified service personnel and warns that shorting terminals can fail the board. Have a Bunn Authorized Service Representative verify the open sensor and replace the probe rather than probing energized circuits yourself.