Bunn error codes, decoded.
Look up any Bunn fault code below. Each one is grounded in Bunn's own service documentation — the meaning, the symptoms, the causes, and the steps to clear it.
Co-founder & CTO · Reviewed August 2026
Bunn sits in our Commercial Kitchen coverage. Every page here is transcribed from the manufacturer's manuals, not scraped from forums.
What error codes does Bunn display?
Tap a code for the full breakdown — meaning, symptoms, causes, and fix steps.
Tank refill timed out — the brewer could not fill the tank within the allowed time and shut down.
Heating Time Too LongThe tank water failed to reach the ready temperature within the allowed time, so the brewer shut down.
Temperature Too LowTank water is below the ready temperature, so brewing is locked out until it heats up.
Temp Sensor Out Of Range, Check For Bad ConnectionsThe temperature sensor circuit reads open — the probe or its wiring is disconnected.
Temp Sensor Out Of Range, Check Wire For ShortsThe temperature sensor circuit reads shorted — the sensor wiring is shorted.
WARNING INACCURATE FLOW - TOO MUCH LIME PLEASE REPAIRThe brewer detected inaccurate water flow caused by heavy lime buildup and is asking for descaling/repair.
WARNING VERY LOW FLOW - PLEASE REPAIRThe brewer detected very low water flow caused by lime buildup and is asking for descaling/repair.
CHECK SPRAYHEAD FOR LIME - CHECK FITTINGS FOR LIMEMaintenance message prompting the operator to delime the sprayhead, valve, and tank.
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