Krupps AL-04 Error Code
Tank loading timeout — the tank did not fill within the maximum time foreseen
Source: Krupps/Krupps_ADVANCE_ServiceManual_CommercialKitchen.pdf
What does Krupps AL-04 mean?
AL-04 on a Krupps dishwasher is a tank loading timeout: the wash tank has not filled with water within the maximum time the control allows. The machine cannot start washing without a filled tank, so it raises the alarm. The display shows 'AL' on the left LEDs with AL-04 on the right and the alarm light flashes.
Symptoms
- ALARM light flashing on the control panel
- 'AL' on the left digit LEDs with the code on the right
- Tank not filling, or filling very slowly
- Cycle will not start / cycle start button red
- No or weak water flow into the tank
Common causes
- Water mains valve not supplying water
- Overflow not inserted, or inserted incorrectly
- Rinse jets obstructed
- Water loading pipe squashed (behind the rear panel)
- Upstream water softener not working
- Solenoid valve filter obstructed / solenoid valve not working / pressure switch / perforated air break / RL2 relay damaged / boiler clogged with limestone (technician checks)
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Diagnostic steps
Check the water supply
User check: confirm the water mains valve is open and actually supplying water to the dishwasher.
Check the overflow
User check: make sure the overflow is inserted and seated correctly so the tank can hold water.
Check the rinse jets and loading pipe
User check: clear obstructed rinse jets and make sure the water loading pipe behind the rear panel is not squashed; also verify any upstream water softener is working.
Technician: inspect solenoid valve and hydraulics
Technician checks: solenoid valve filter obstructed, solenoid valve not working, pressure switch not working, perforated air break, circuit board RL2 relay damaged, boiler clogged with limestone.
When to call a professional
Start with the user checks — water supply, overflow seating, rinse jets and the loading pipe. If water is reaching the machine and the tank still will not fill, the manual escalates to technician checks of the solenoid valve and its filter, the pressure switch, the air break, the RL2 relay and limescale in the boiler. Those involve the hydraulic circuit and control board, so call qualified service.
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Other Krupps Error Codes
Faulty boiler probe and tank probe — both temperature probes are faulty; heating is disabled
Faulty boiler probe — boiler probe not connected, interrupted or shorted; boiler heating disabled
Faulty tank probe — tank probe not connected, interrupted or shorted
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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