Diagnostics - Heatcraft Refrigeration Products II Installation & Operating Instructions Manual

Beacon II Troubleshooting Guide
PROBLEM Step ACTION ITEM
1.
2.
LED is not lit. 3.
4.
5.
1.
2.
LED shows Coo , but
compressor will not run. 3.
4.
ERROR CODES:
E1
Room Sensor
E2 Defrost Sensor
E3
Suction Sensor
E4
Suction Transducer
E5 Outdoor Sensor
1.
2.
E6 Low Superheat
3.
During Cooling 4.
(0°F for 2 minutes)
5.
6.
7.

Diagnostics

Check Primary Power Supply Disconnect
Check Voltage to Evaporator Transformer
Check Transformer Secondary Output Volts
Check Voltage at Control Board (24V and C)
Replace Control Board
Check Compressor internal overloads
Check Control Power to Condensing Unit
(24 Volts across "COMP" and "C" at board)
Check Compressor Contactor Coil Voltage
Check Compressor Contactor "pulled in"
Check Sensor and Board Connection
Check Sensor and Board Connection
Check Sensor and Board Connection
Check Transducer and Board Connection
Check Sensor, wiring and Board Connection
Check Refrigerant Type
Check coil for ice
Check Control Board step position from board LED
Check Electric Expansion Valve Closure
Compressor Not Operating
Check Suction Temperature Sensor
Check Suction Pressure Transducer
32
IF OK IF NOT OK
1. Check fuses and circuit breakers
Go to 2. Check field wiring for breaks
next step 3. Replace if necessary
4. Check factory wiring and connections
1. Wait for reset
2. Check transformer voltage (secondary and
Go to primary) and wiring of 208V power taps.
next step 3. Check internal condensing unit wiring
4. Replace as needed
Replace as needed
Replace as needed
Replace as needed
Replace as needed
Replace or remove
1. Compare board setpoint and refrigerant
2. Defrost coil and check defrost cycle
settings/setpoints, defrost sensor and
heater amps.
3. Replace board if EEV steps not at 2.
Go to 4. Pumpdown system see if LPS opens or if it
next step times out (EEV is bad or LPS is set
incorrectly, if times out) – See Pumpdown.
5. Check overloads and contactor.
6. Compare board sensor reading against
actual suction line temperature.
7. Compare pressure reading against gauges.