Krupps AL-06 Error Code
Heating timeout — the dishwasher did not heat the water within the intended maximum time; heating disabled
Source: Krupps/Krupps_ADVANCE_ServiceManual_CommercialKitchen.pdf
What does Krupps AL-06 mean?
AL-06 on a Krupps dishwasher is a heating timeout: the machine did not bring the water up to temperature within the maximum time the control allows, so heating is disabled. This typically points to a power, heating-element or contactor problem. The display shows 'AL' on the left LEDs with AL-06 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
- Water not reaching temperature — heating disabled
- Dishes come out cold / not sanitised
- Cycle start button red (alarm state)
Common causes
- Three-phase electric plug connected incorrectly
- Three-phase power fuses blown
- Tank or boiler resistance power plugs disconnected or damaged
- Tank resistance or boiler resistance damaged
- Circuit board RL6 or RL7 relay, or three-phase heating contactor, damaged
- Tank pressure switch damaged, or a tripped tank/boiler safety thermostat
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Diagnostic steps
Request a technician
The manual directs the final user to request the intervention of a technician for AL-06; the checks below are technician-level because they involve mains power and heating circuits.
Check three-phase supply and fuses
Technician checks: confirm the three-phase electric plug is connected correctly and that no three-phase power fuses are blown.
Check the heating resistances and plugs
Technician checks: verify the tank/boiler resistance power plugs are connected and undamaged, and that the tank and boiler resistances themselves are not damaged.
Check relays, contactor, pressure switch and safety thermostats
Technician checks: inspect the RL6/RL7 board relays and the three-phase heating contactor; check the tank pressure switch; and reset a tripped tank or boiler safety thermostat.
When to call a professional
AL-06 is a heating-circuit fault the manual assigns to a technician. Call qualified service: the checks involve three-phase wiring and fuses, the tank and boiler heating resistances and their plugs, the RL6/RL7 board relays and heating contactor, the pressure switch, and resetting tripped safety thermostats. This is high-voltage, heating-element work that must not be attempted by the operator.
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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
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
Exhausted brine — not enough brine (water and salt) for the resin regeneration of the built-in softener
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