Carrier Understanding Alarm Codes for Air Conditioners

ICVC FAULT

PRIMARY

SECONDARY

PRIMARY CAUSE

ADDITIONAL CAUSE/REMEDY

STATE

MESSAGE

MESSAGE

220

PROTECTIVE LIMIT

GROUND FAULT

220→Ground Fault Trip;

Check for condensation on motor terminals.

Check Motor and Current

Check motor power leads for phase to phase or

Sensors.

phase to ground shorts. Disconnect motor from

VFD and megger motor.

Call Carrier Service.

221

PROTECTIVE LIMIT

UNUSED

221→UNUSED

222

PROTECTIVE LIMIT

LINE FREQUENCY TRIP

222→Line Frequency —

If operating from a generator, check generator

[VALUE] exceeded limit of

size and speed.

[LIMIT]; Check Power Supply.

Check utility power supply.

223

LOSS OF

WITH VFD GATEWAY

223→Loss of SIO Comm with

Check VFD communication wiring and

COMMUNICATION

MODULE

VFD Gateway: Check VFG

connectors on VFD Gateway and DPI board.

Module and Power.

Check for compatibility between ICVC and

Gateway software.

224

PROTECTIVE LIMIT

VFD COMMUNICATIONS

224→Loss of DPI Comm with

Check VFD communication wiring and

FAULT

VFD Gateway: Check VFG to

connectors.

VFD Comm.

Check status lights on DPI Communications

Interface Board.

Call Carrier Service.

225

PROTECTIVE LIMIT

MOTOR CURRENT

225→Motor Current Imbal-

Check Motor Current % Imbalance in

IMBALANCE

ance: Check VFD Fault

VFD_CONF screen.

History for Values.

226

PROTECTIVE LIMIT

LINE PHASE REVERSAL

226→Line Phase Reversal:

Reverse connections of any two line conductors

Check Line Phases.

to circuit breaker.

227

PROTECTIVE LIMIT

OIL PRESS SENSOR

227→Oil Pressure Delta P

Check transducer wiring and accuracy.

FAULT

[VALUE] (Pump Off): Check

Check power supply to pump.

Pump/Transducers.

Check pump operation.

Check transducer calibration.

228

PROTECTIVE LIMIT

LOW OIL PRESSURE

228→Low Operating Oil

Check transducer wiring and accuracy.

Pressure [VALUE]: Check Oil

Check power supply to pump.

Pump and Filter.

Check pump operation.

Check oil level.

Check for partially closed service valves.

Check oil filters.

Check for foaming oil at start-up.

Check transducer calibration.

229

PROTECTIVE LIMIT

LOW CHILLED WATER

229→Low Chilled Water Flow;

Perform pump control test.

FLOW

Check Switch/Delta P Config

Check optional transducer calibration and

& Calibration.

wiring.

Check Evaporator Refrigerant Temperature

sensor.

Check chilled water valves.

Check for evaporator saturation temperature

< 34 F if not in Pumpdown Lockout mode. Place

unit in Pumpdown mode before removing

charge.

230

PROTECTIVE LIMIT

LOW CONDENSER

230→Low Condenser Water

Perform pump control test.

WATER FLOW

Flow; Check Switch/Delta P

Check optional transducer calibration and

Config & Calibration.

wiring.

Check condenser water valves.

Check for COND PRESS OVERRIDE + 5 psig.

231

PROTECTIVE LIMIT

HIGH DISCHARGE TEMP

231→Comp Discharge Temp

Check for closed compressor discharge isola-

[VALUE] Exceeded Limit of

tion valve.

[LIMIT]*.

Check if chiller was operating in surge.

Check sensor resistance or voltage drop.

Check for proper wiring.

Check for proper condenser flow and

temperature.

Check compressor discharge isolation valve.

Check for proper inlet guide vane and optional

diffuser actuator operation.

232

PROTECTIVE LIMIT

LOW REFRIGERANT

232→Evaporator Refrig Temp

Check for proper refrigerant charge.

TEMP

[VALUE] exceeded limit of

Check float valve operation.

[LIMIT]*.

Check for closed condenser liquid line isolation

valve. If problem occurs at high load, check for

low condenser pressure which causes inade-

quate flasc orifice differential pressure.

Check for proper water flow and temperature.

Confirm that condenser water enters bottom row

of condenser tubes first.

Check Evaporator Refrigerant Temperature

sensor.

Check for division plate gasket bypass.

Check for fouled tubes.