How to Troubleshoot a 30HXC Chiller

Verify that the main power switch is turned “On” if the Carrier chiller is not operating. Reset the circuit breaker if needed and contact Carrier if the “Low Refrigerant” indicator light is lit. Note that the unit will automatically shut off when the cooling load is met and will resume operation when cooling is needed again. If the unit shuts down due to external power failure, the power will restart automatically.

Reset the red button on the main control panel if the high pressure switch is open. Check the sides of the Carrier unit to ensure the air flow is not obstructed.

Push “Enter” and “Escape” at the same time if the alarm sounds. The alarm description will show on the display panel.

Troubleshoot most error codes by increasing the water temperature setting on the main control panel and checking the oil filter, replacing it if necessary. Close the angle valve and the ball valve on the external oil filter and connect a charging hose to the oil pressure bleed port. Allow the oil between the two valves to drain, which is typically about a quart in volume. Disconnect the hose and unscrew the nut from the filter. Remove the filter and install the new filter. Reconnect the charging port and open the valves again to draw a vacuum. Remove the hose one more time and open the angle valve just enough that oil slows out. Close the angle valve and open the ball valve. Make sure the oil valve is open and is not stuck or clogged.

Contact Carrier for assistance if troubleshooting does not resolve the problem. The oil level may be low, or there may be failure of the oil pump, solenoid, transducer, control panel or check valve.