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Temperature Too LowBunn

Bunn Temperature Too Low

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

Source: Bunn/BU-AXIOM_sm.pdf

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What does Bunn Temperature Too Low mean?

On AXIOM digital brewers, Temperature Too Low means the water temperature in the tank does not meet the ready temperature. With the brew lockout feature enabled, the brewer will not start a brew cycle until the tank reaches the programmed temperature. It is most common right after start-up, a large back-to-back brew, or a fresh refill of cold water.

Symptoms

  • Display reads "Temperature Too Low"
  • Brewer will not start a brew cycle
  • Display has not yet reached ready
  • Often seen after start-up or back-to-back brewing

Common causes

  • Tank water has not yet heated to the ready temperature
  • Cold water just refilled the tank after a brew
  • Brew lockout feature is enabled and holding off the brew

Diagnostic steps

  1. 01

    Wait for the brewer to heat up

    Allow the brewer to heat to the proper temperature. Once the tank reaches the ready temperature the message clears and brewing is allowed.

  2. 02

    Confirm it is not a persistent heating fault

    If the tank never reaches ready, this can shade into a heating problem. Make sure the display eventually reads ready rather than staying locked out indefinitely.

  3. 03

    Disable the brew lockout if appropriate

    The brew lockout function can be disabled in the programming section per the documented procedure if a technician decides brewing should be allowed below the ready temperature.

  4. 04

    Re-test a brew once ready

    After the display reads ready, start a normal brew cycle to confirm the lockout has released and water temperature is correct.

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When to call a professional

This message is usually normal heat-up behavior and clears on its own, so a technician is not always required. Call a Bunn Authorized Service Representative if the tank never reaches ready, if the message persists after a full heat-up, or if you want the brew lockout setting changed — programming-level changes and any heater or sensor diagnosis behind a stuck low temperature should be done by qualified service personnel.

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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.

Temp Sensor Out Of Range, Check For Bad Connections

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

Temp Sensor Out Of Range, Check Wire For Shorts

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

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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