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Temp Sensor Out Of Range, Check Wire For ShortsBunn

Bunn Temp Sensor Out Of Range, Check Wire For Shorts

The temperature sensor circuit reads shorted — the sensor wiring is shorted.

Source: Bunn/BU-AXIOM_sm.pdf

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What does Bunn Temp Sensor Out Of Range, Check Wire For Shorts mean?

On AXIOM digital brewers, this diagnostic message means the temperature sensor reads out of range because the sensor wire is shorted. The control board sees an invalid temperature caused by a short in the sensor wiring rather than an open circuit. The manual pairs this message with the instruction to check the wire for shorts, distinguishing it from the open-circuit version of the fault.

Symptoms

  • Display reads "Temp Sensor Out Of Range, Check Wire For Shorts"
  • Brewer cannot read a valid tank temperature
  • Brewer will not reach ready or brew normally
  • Temperature reading is out of range

Common causes

  • Temperature sensor probe wire(s) shorted
  • Sensor wiring pinched or chafed to ground
  • Failed temperature sensor probe reading shorted

Diagnostic steps

  1. 01

    Check the sensor wire for shorts

    Inspect the temperature sensor wiring for shorted, pinched, or chafed conductors as the message directs. A short anywhere in the run produces this out-of-range reading.

  2. 02

    Confirm the probe is shorted, not open

    Verify the fault is a short rather than an open circuit, which would display the check-connections version of the message instead.

  3. 03

    Replace or repair the sensor

    If the temperature sensor probe or its wiring is shorted, replace or repair it as needed.

  4. 04

    Re-test after repair

    After clearing the short or fitting a new probe, power up and confirm the display reads a valid temperature and reaches ready.

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When to call a professional

Tracing a short in the sensor wiring means working inside a brewer that is heated at all times with live line voltage on adjacent components, and the manual warns that shorting terminals or applying external voltage can fail the control board. Inspection, testing, and repair of electrical equipment should be done only by qualified service personnel, so have a Bunn Authorized Service Representative locate the short and replace the probe.

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Other Bunn error codes

Fill Time Too Long

Tank refill timed out — the brewer could not fill the tank within the allowed time and shut down.

Heating Time Too Long

The tank water failed to reach the ready temperature within the allowed time, so the brewer shut down.

Temperature Too Low

Tank water is below the ready temperature, so brewing is locked out until it heats up.

Temp Sensor Out Of Range, Check For Bad Connections

The temperature sensor circuit reads open — the probe or its wiring is disconnected.

WARNING INACCURATE FLOW - TOO MUCH LIME PLEASE REPAIR

The brewer detected inaccurate water flow caused by heavy lime buildup and is asking for descaling/repair.

WARNING VERY LOW FLOW - PLEASE REPAIR

The brewer detected very low water flow caused by lime buildup and is asking for descaling/repair.

CHECK SPRAYHEAD FOR LIME - CHECK FITTINGS FOR LIME

Maintenance message prompting the operator to delime the sprayhead, valve, and tank.

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