Carrier AquaSnap condenser fan motor
Use for A2 high-pressure faults after confirming the fan is powered but failed.
$200-$700
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Carrier AquaSnap Chiller Fault Codes — Quick Reference
Carrier AquaSnap 30RB (air-cooled liquid chiller) and 30RQ (heat pump) use the Pro-Dialog+ or i-Vue controller. Alarms appear as codes with descriptions on the controller display.
| Alarm Code | Meaning | Quick Fix |
|---|---|---|
| A1 — Low Pressure | Suction pressure safety | Check refrigerant charge and evap flow |
| A2 — High Pressure | Discharge pressure safety | Check fans and condenser coil |
| A3 — Low LWT | Leaving water temp below limit | Check flow and freeze protection |
| A4 — Compressor Overload | Compressor motor tripped | Check current, voltage, and contacts |
| A5 — High Discharge Temp | Compressor discharge too hot | Check charge and condenser |
| A6 — Loss of Flow | Chilled water flow lost | Check pump, filter, and flow switch |
| A7 — Loss of Phase | Phase loss detected | Check electrical supply |
| A8 — High Motor Temp | Compressor thermal protection | Check voltage and cooling |
Most Common Faults
A1 — Low Pressure Alarm
Low refrigerant suction pressure is the top alarm on AquaSnap chillers. Check chilled water flow rate first — a closed pump valve, blocked strainer, or pump failure causes the evaporator to starve. If flow is confirmed, check the refrigerant charge.
A2 — High Pressure Alarm
High discharge pressure trips are common in summer. Check: all condenser fans are running (visually verify), condenser coil is clean, and ambient temperature is within the unit’s rating. 30RB units use multiple fans — if one fan fails, high pressure can follow on hot days.
A6 — Loss of Flow
The flow switch in the evaporator has opened. Check: pump breaker, pump rotation (check at VFD if applicable), strainer, and flow switch condition. A dirty flow switch can give false trips.
Pro-Dialog+ Controller Navigation
- ALARM button → shows active alarms and history
- STATUS button → live operating data (pressures, temperatures, current)
- SETPOINTS → operating limits configuration
i-Vue Controller
The i-Vue touchscreen shows alarm icons in the top bar. Tap the icon to see fault description. The event history shows the last 200 events with timestamps.
Parts Often Needed
| Part | Notes |
|---|---|
| Condenser fan motor | Replace on A2 high pressure faults |
| Flow switch | Replace on repeated A6 faults |
| Refrigerant charge | After leak repair |
| High pressure switch | Replace if repeatedly tripping |
Technician Tips
Carrier uses different diagnostic systems across furnaces, heat pumps, chillers, mini-splits, VRF equipment, rooftop units, and communicating controls. Confirm the full model number and whether the fault came from the indoor board, outdoor board, thermostat, or equipment controller before matching it to a repair path.
Start with power, wiring, airflow or water-flow, sensor, condensate, and safety-circuit checks before ordering control boards. If the same code returns after one reset and the basic cause is not obvious, test the named circuit instead of repeatedly cycling the equipment.
Need Replacement Parts?
Before ordering, match the HVAC part to the model number, electrical rating, and failure symptom. Check current prices on Amazon - prices and availability change frequently.
Jump to Fix
- A1 low pressure → Check chilled water flow → Check refrigerant charge → Inspect evap
- A2 high pressure → Verify all fans running → Clean condenser coil
- A6 loss of flow → Check pump → Inspect strainer → Test flow switch
When to Call a Pro
Carrier (Carrier Commercial Service) handles refrigerant work and compressor replacement. Call 1-800-379-6484 for service support.