Krupps AL-01 Error Code
Faulty boiler probe and tank probe — both temperature probes are faulty; heating is disabled
Source: Krupps/Krupps_ADVANCE_ServiceManual_CommercialKitchen.pdf
What does Krupps AL-01 mean?
On a Krupps dishwasher, AL-01 means both temperature probes — the boiler probe and the tank probe — are faulty at the same time. The control board can no longer read either water temperature, so it disables heating as a safety measure. The display shows 'AL' on the left LEDs with the code on the right LEDs, and the alarm light flashes.
Symptoms
- ALARM light flashing on the control panel
- 'AL' message on the left digit LEDs with the alarm code on the right
- Cycle start button shows red (alarm state)
- Water is not heating — heating is disabled
- Dishes come out cold, poorly washed or not sanitised
Common causes
- Both the boiler and tank temperature probes are faulty
- Probe connector on the power board disconnected or damaged
- Wiring to both probes interrupted or shorted
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Diagnostic steps
Note the alarm and request a technician
The manual instructs the final user to request the intervention of a technician; AL-01 is not a user-resettable condition. Switch the machine off and on — if the alarm returns, service is needed.
Remove and replace the probe connector
Technician check 1: remove and replace the probe connector on the power board so both probe signals are read correctly.
Replace the probes
Technician check 2: replace the temperature probes, as the manual lists both probes as faulty for this alarm.
Power-cycle and confirm heating returns
After repair, turn the dishwasher off and on. Heating should re-enable and the alarm should clear once both probes read correctly.
When to call a professional
AL-01 is a board/probe-level fault: the manual tells the end user to request a technician, while the actual checks (replacing the probe connector on the power board and replacing the probes) are reserved for the repair technician. If a power-cycle does not clear it, stop using the machine for sanitising loads and call qualified service — working inside the power board and probe wiring requires a trained technician.
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Other Krupps Error Codes
Faulty boiler probe — boiler probe not connected, interrupted or shorted; boiler heating disabled
Faulty tank probe — tank probe not connected, interrupted or shorted
Tank loading timeout — the tank did not fill within the maximum time foreseen
Drain timeout — the tank pressure switch did not open at the end of the total drain cycle
Heating timeout — the dishwasher did not heat the water within the intended maximum time; heating disabled
Exhausted brine — not enough brine (water and salt) for the resin regeneration of the built-in softener
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