Krupps AL-06

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

Diagnostic steps

1. 01

   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.

2. 02

   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.

3. 03

   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.

4. 04

   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.