CARR

Carrier A1.03

Medium

Pro-Dialog+ (30RB060-390) — Compressor A1 high pressure switch open.

Carrier A1.03: Compressor A1 high pressure switch open. This fault usually isn't an immediate stop, but should be checked soon.

Possible causes

Dirty/blocked condenser, refrigerant overcharge, fan failure, air recirculation.

Check steps

Clean condenser, check fan/rotation, verify charge.

Affected parts

Hochdruckschalter
Verflüssiger

Safety note

Manual reset required.

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 motor temperature too high (PTC A1.01 Compressor A1 crankcase heater failure.A1.02 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