De Dietrich Prestige No Frost / DRS Multi-Zone Refrigerator: High temperature alarm in freezer compartment AL01; internal temperature rises above -9°C and audible buzzer sounds.
On De Dietrich refrigeration units featuring Prestige No Frost multi-sensor refrigeration, active preservation zone, and inverter compressor modulation: Door left ajar, magnetic perimeter gasket damaged, loss of refrigerant gas charge (R600a), or weak compressor pump.
Check door closure and verify magnetic seal airtightness with a paper strip. Allow 12 hours for stabilization if newly stocked. If compressor runs continuously without cooling, leak test system. Touch and hold the Alarm Acknowledge and Quick Chill icons for 8 seconds until the ICS chime signals buffer reset, then release.
