Bunn WARNING VERY LOW FLOW - PLEASE REPAIR Error Code
The brewer detected very low water flow caused by lime buildup and is asking for descaling/repair.
Source: Bunn/BU-AXIOM_sm.pdf
What does Bunn WARNING VERY LOW FLOW - PLEASE REPAIR mean?
On AXIOM digital brewers, this warning means the control has detected very low water flow during a brew and asks for repair. The documented cause is lime (scale) buildup restricting the water path. As scale accumulates in the sprayhead, brew valve, or brew tank, flow drops below what the brewer expects, triggering this please-repair message until the brewer is descaled.
Symptoms
- Display reads "WARNING VERY LOW FLOW" / "PLEASE REPAIR"
- Noticeably low water flow during brewing
- Lime/scale buildup in the sprayhead or fittings
- Reduced beverage volume or longer brew time
Common causes
- Lime buildup in the sprayhead
- Lime buildup in the brew valve
- Lime buildup in the brew tank
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Diagnostic steps
Clean the sprayhead
Lime in the sprayhead is the first listed cause of very low flow. Remove and delime the sprayhead so all holes are clear.
Clean the brew valve
Clean the brew valve to clear lime that is choking the water path and lowering flow.
Clean the brew tank
Delime the brew tank to remove scale restricting flow. Use a deliming agent as required.
Re-test brewing flow
After deliming the sprayhead, valve, and tank, run a brew cycle and confirm the very-low-flow warning clears.
When to call a professional
Deliming the sprayhead, valve, and tank is standard operator maintenance, but very low flow that will not clear after a full descale points to a restricted or failed brew valve or a control issue. Call a Bunn Authorized Service Representative if the warning persists after cleaning or if the brew valve needs rebuilding or replacement, since that work touches the brewer's plumbing and electrical systems and is intended for qualified service personnel.
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Other Bunn Error Codes
Tank refill timed out — the brewer could not fill the tank within the allowed time and shut down.
The tank water failed to reach the ready temperature within the allowed time, so the brewer shut down.
Tank water is below the ready temperature, so brewing is locked out until it heats up.
The temperature sensor circuit reads open — the probe or its wiring is disconnected.
The temperature sensor circuit reads shorted — the sensor wiring is shorted.
The brewer detected inaccurate water flow caused by heavy lime buildup and is asking for descaling/repair.
Maintenance message prompting the operator to delime the sprayhead, valve, and tank.