Carrier A1.02

High

Pro-Dialog+ (30RB060-390) — Compressor A1 crankcase heater failure.

Carrier A1.02: Compressor A1 crankcase heater failure. This fault noticeably affects operation.

Possible causes

Wiring error, failed crankcase heater, failed SPM.

Check steps

Check crankcase heater current draw and wiring.

Affected parts

Kurbelgehäuseheizung
SPM-Modul

Safety note

Isolate power before testing.

Source: Carrier AquaSnap 30RB060-390 Pro-Dialog+ Controls, Start-Up, Operation, Service and Troubleshooting Instructions (Form 30RB-7T), Table 46 Alarm Codes + alarm descriptions, p.63-78

Reviewed by Anıl Güzeldemir — in the refrigeration machine room since 2006, developer of Enthalio.

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Related fault codes

Compressor A1 motor temperature too high (PTC A1.01 Compressor A1 high pressure switch open.A1.03 Compressor A1 motor sensor PTC out of range (&A1.04 Condenser flow switch failure (heat reclaim unP.15 Loss of communication with System Manager.P.29 Master/Slave communication failure.P.30