Bunn
Bunn Coffee Makers Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E01
Digital Bunn coffee maker will not heat; display shows E01 shortly after power-up and brew will not start.
Tank Heater Circuit Failure
E02
Digital Bunn coffee maker displays E02 and stops brewing; unit may fill but does not heat properly.
Temperature Sensor (Thermistor) Fault
E03
Bunn digital brewer shows E03 and will not brew; sometimes occurs after a dry-fire or overheating event.
High-Limit Thermostat Tripped or Open
E04
Bunn coffee maker displays E04 and stops mid-brew or will not start brewing at all.
Water Level Sensor or Fill System Error
E05
Bunn digital brewer shows E05; brew cycle may abort or not start, often associated with flow meter issues on models with volume-based brewing.
Flow Meter Signal Error
E06
Bunn coffee maker displays E06; unit may power on but controls are unresponsive or partially functional.
Control Board Communication or Internal Fault
E07
Bunn digital brewer shows E07 and may shut down or refuse to start; often associated with overfill or overflow conditions.
Tank Overfill / Overflow Detection
E08
Bunn coffee maker displays E08; brew cycle may terminate early or not start, often related to brew valve or dispense issues.
Brew Valve / Dispense Valve Error
E09
Bunn digital brewer shows E09; unit may not power up fully or may randomly reset.
Low Voltage / Power Supply Error
E10
Bunn coffee maker displays E10; often associated with sensor calibration or out-of-range readings on advanced models.
Sensor Calibration / Out-of-Range Error
Symptom
Bunn coffee maker brews but the water is only lukewarm.
Low Brew Temperature
Symptom
Bunn coffee maker brews extremely slowly; it takes much longer than normal to fill the carafe.
Restricted Brew Flow / Scale Buildup
Symptom
Bunn coffee maker does not keep water hot; ready light never comes on or cycles off quickly.
Tank Heating / Thermostat Failure
Symptom
Bunn coffee maker emits a burning smell during operation.
Overheating Component or Electrical Insulation Failure
Symptom
Bunn coffee maker emits a moldy or musty odor from the tank or brew area.
Microbial Growth / Poor Sanitation
Symptom
Bunn coffee maker heats but does not dispense water through the sprayhead during brew.
No Brew Water Flow
Symptom
Bunn coffee maker intermittently shuts off or resets during brewing.
Intermittent Power Loss / Overheat Protection
Symptom
Bunn coffee maker leaks water from the bottom of the unit during or after brewing.
Internal Leak / Tank or Tubing Failure
Symptom
Bunn coffee maker makes loud hissing or steam escaping sounds from the top or sides.
Steam Leak / Venting Issue
Symptom
Bunn coffee maker makes loud popping or boiling noises while heating.
Kettling / Localized Boiling from Scale
Symptom
Bunn coffee maker overflows the brew funnel or carafe during brewing.
Brew Overflow / Excessive Flow
Symptom
Bunn coffee maker powers on but will not brew when the brew button is pressed.
Brew Start / Control Input Failure
Symptom
Bunn coffee maker produces a plastic or chemical taste in the coffee, especially when new.
Residual Manufacturing Oils / Contaminants
Symptom
Bunn coffee maker warmer plate does not heat; coffee gets cold quickly.
Warmer Element Failure
Symptom
Bunn coffee maker warmer plate is too hot, scorching coffee.
Overheating Warmer Plate
Symptom
Bunn coffee maker will not power on at all; no lights or display.
No Power / Dead Unit
Symptom
Bunn coffee maker's brew volume is inconsistent; sometimes overfills, sometimes underfills the carafe.
Inconsistent Brew Volume Control
Symptom
Bunn coffee maker's buttons or touchpad do not respond or respond intermittently.
Keypad / Switch Input Failure
Symptom
Bunn coffee maker's carafe leaks from the handle or base.
Carafe Seal Failure
Symptom
Bunn coffee maker's digital display is blank or very dim, but the unit still heats or brews.
Display / Backlight Failure
Symptom
Bunn coffee maker's spray pattern is uneven, with water streaming from only one side of the sprayhead.
Uneven Spray Pattern
Symptom
Bunn coffee maker's thermal carafe does not keep coffee hot for long.
Thermal Carafe Insulation Failure
Symptom
Bunn coffee maker's water reservoir (on models with removable tanks) leaks or seeps water when filled.
Reservoir Seal or Crack
Symptom
Bunn coffee tastes bitter or over-extracted.
Over-Extraction / Excessive Brew Temperature or Contact Time
Symptom
Bunn coffee tastes weak or under-extracted even though brew volume is correct.
Under-Extraction / Low Brew Temperature or Contact Time
Symptom
On plumbed-in Bunn coffee makers, the unit does not fill with water automatically.
No Automatic Fill
Symptom
On plumbed-in Bunn coffee makers, water continues to flow into the tank and may overflow.
Fill Valve Stuck Open
Symptom
Water drips continuously from the Bunn sprayhead even when not brewing.
Tank Overfill or Valve Not Sealing
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Digital Bunn coffee maker will not heat; display shows E01 shortly after power-up and brew will not start.
|
Tank Heater Circuit Failure | View Details |
| E02 |
Digital Bunn coffee maker displays E02 and stops brewing; unit may fill but does not heat properly.
|
Temperature Sensor (Thermistor) Fault | View Details |
| E03 |
Bunn digital brewer shows E03 and will not brew; sometimes occurs after a dry-fire or overheating event.
|
High-Limit Thermostat Tripped or Open | View Details |
| E04 |
Bunn coffee maker displays E04 and stops mid-brew or will not start brewing at all.
|
Water Level Sensor or Fill System Error | View Details |
| E05 |
Bunn digital brewer shows E05; brew cycle may abort or not start, often associated with flow meter issues on models with volume-based brewing.
|
Flow Meter Signal Error | View Details |
| E06 |
Bunn coffee maker displays E06; unit may power on but controls are unresponsive or partially functional.
|
Control Board Communication or Internal Fault | View Details |
| E07 |
Bunn digital brewer shows E07 and may shut down or refuse to start; often associated with overfill or overflow conditions.
|
Tank Overfill / Overflow Detection | View Details |
| E08 |
Bunn coffee maker displays E08; brew cycle may terminate early or not start, often related to brew valve or dispense issues.
|
Brew Valve / Dispense Valve Error | View Details |
| E09 |
Bunn digital brewer shows E09; unit may not power up fully or may randomly reset.
|
Low Voltage / Power Supply Error | View Details |
| E10 |
Bunn coffee maker displays E10; often associated with sensor calibration or out-of-range readings on advanced models.
|
Sensor Calibration / Out-of-Range Error | View Details |
| – |
Bunn coffee maker brews but the water is only lukewarm.
|
Low Brew Temperature | View Details |
| – |
Bunn coffee maker brews extremely slowly; it takes much longer than normal to fill the carafe.
|
Restricted Brew Flow / Scale Buildup | View Details |
| – |
Bunn coffee maker does not keep water hot; ready light never comes on or cycles off quickly.
|
Tank Heating / Thermostat Failure | View Details |
| – |
Bunn coffee maker emits a burning smell during operation.
|
Overheating Component or Electrical Insulation Failure | View Details |
| – |
Bunn coffee maker emits a moldy or musty odor from the tank or brew area.
|
Microbial Growth / Poor Sanitation | View Details |
| – |
Bunn coffee maker heats but does not dispense water through the sprayhead during brew.
|
No Brew Water Flow | View Details |
| – |
Bunn coffee maker intermittently shuts off or resets during brewing.
|
Intermittent Power Loss / Overheat Protection | View Details |
| – |
Bunn coffee maker leaks water from the bottom of the unit during or after brewing.
|
Internal Leak / Tank or Tubing Failure | View Details |
| – |
Bunn coffee maker makes loud hissing or steam escaping sounds from the top or sides.
|
Steam Leak / Venting Issue | View Details |
| – |
Bunn coffee maker makes loud popping or boiling noises while heating.
|
Kettling / Localized Boiling from Scale | View Details |
| – |
Bunn coffee maker overflows the brew funnel or carafe during brewing.
|
Brew Overflow / Excessive Flow | View Details |
| – |
Bunn coffee maker powers on but will not brew when the brew button is pressed.
|
Brew Start / Control Input Failure | View Details |
| – |
Bunn coffee maker produces a plastic or chemical taste in the coffee, especially when new.
|
Residual Manufacturing Oils / Contaminants | View Details |
| – |
Bunn coffee maker warmer plate does not heat; coffee gets cold quickly.
|
Warmer Element Failure | View Details |
| – |
Bunn coffee maker warmer plate is too hot, scorching coffee.
|
Overheating Warmer Plate | View Details |
| – |
Bunn coffee maker will not power on at all; no lights or display.
|
No Power / Dead Unit | View Details |
| – |
Bunn coffee maker's brew volume is inconsistent; sometimes overfills, sometimes underfills the carafe.
|
Inconsistent Brew Volume Control | View Details |
| – |
Bunn coffee maker's buttons or touchpad do not respond or respond intermittently.
|
Keypad / Switch Input Failure | View Details |
| – |
Bunn coffee maker's carafe leaks from the handle or base.
|
Carafe Seal Failure | View Details |
| – |
Bunn coffee maker's digital display is blank or very dim, but the unit still heats or brews.
|
Display / Backlight Failure | View Details |
| – |
Bunn coffee maker's spray pattern is uneven, with water streaming from only one side of the sprayhead.
|
Uneven Spray Pattern | View Details |
| – |
Bunn coffee maker's thermal carafe does not keep coffee hot for long.
|
Thermal Carafe Insulation Failure | View Details |
| – |
Bunn coffee maker's water reservoir (on models with removable tanks) leaks or seeps water when filled.
|
Reservoir Seal or Crack | View Details |
| – |
Bunn coffee tastes bitter or over-extracted.
|
Over-Extraction / Excessive Brew Temperature or Contact Time | View Details |
| – |
Bunn coffee tastes weak or under-extracted even though brew volume is correct.
|
Under-Extraction / Low Brew Temperature or Contact Time | View Details |
| – |
On plumbed-in Bunn coffee makers, the unit does not fill with water automatically.
|
No Automatic Fill | View Details |
| – |
On plumbed-in Bunn coffee makers, water continues to flow into the tank and may overflow.
|
Fill Valve Stuck Open | View Details |
| – |
Water drips continuously from the Bunn sprayhead even when not brewing.
|
Tank Overfill or Valve Not Sealing | View Details |
No matching codes found
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