CARR

Carrier A1.01

Medium

Pro-Dialog+ (30RB060-390) — Compressor A1 motor temperature too high (PTC resistance > 4.5k Ω).

Carrier A1.01: Compressor A1 motor temperature too high (PTC resistance > 4.5k Ω). This fault usually isn't an immediate stop, but should be checked soon.

Possible causes

Compressor failure, wiring error, operation outside limits, improper refrigerant charge.

Check steps

Measure PTC sensor resistance, check wiring and refrigerant charge.

Affected parts

Verdichter A1
PTC-Fühler

Safety note

Manual reset required — resolve cause before restart.

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.

Look up in Enthalio →

Related fault codes

Compressor A1 crankcase heater failure.A1.02 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