Carrier 19DK (DM) series fault code and fault handling method
category
Code
Description / fault situation
Possible cause/countermeasure
Timer
0-15
From the next start time (already divided into units)
It is forbidden to start in 15 minutes or 3 minutes. The timer is not completed.
Startup state
20
Start the freezer on the S/D board
After the control power is sent or after the POR, the LCD displays a countdown of three minutes, and the code of the start state of the freezer will appear.
Startup state
twenty one
Start the freezer from the remote control switch
After the control power is sent or after the POR, the LCD displays a countdown of three minutes, and the code of the start state of the freezer will appear.
Startup state
twenty two
Start the freezer on the expansion monitor (ESP)
After the control power is sent or after the POR, the LCD displays a countdown of three minutes, and the code of the start state of the freezer will appear.
Startup state
twenty three
Waiting for the start signal from the main freezer
After the control power is sent or after the POR, the LCD displays a countdown of three minutes, and the code for the start state of the freezer will appear.
Startup state
twenty four
The sub-compressor is set at the position of indefinite operation (DISABLED)
The DIP SWITCH that sets the sub-compressor not to operate is set to the ON position.
Startup state
25
Recycling operation has not started
The ice water or brine effluent temperature is too low to meet the conditions for recirculation start-up (ice water temperature ≤ 5 °F (2-8 ° C) above the set point.
Startup state
26
Startup process in progress
Perform pre-start inspection, water flow and oil pressure are being established.
Operational state
28
Capacity control
The main unit is operating normally under temperature control
Operational state
29
Ramp Loading Capacity Control
Ice water effluent temperature reduction rate is controlled by Ramp loading
Operational state
30
Power demand limit capacity control
Compressor motor current power demand set point - confirm that the motor current correction point is correct
Operational state
35
Motor temperature priority control
The motor temperature >200°F (93.3°C) confirms the motor temperature and the resistance of the temperature sensor.
Operational state
36
Refrigerant temperature priority control
Refrigerant temperature ≤ 1°F above the set point (0.56°C)
Operational state
37
Exhaust frequency is too frequent
Please see the location of the AUTO, the exhaust cycle is too frequent / inside the description
Fault state before start
40
Motor coil temperature is too high
The motor temperature is >190°F (87.8°C). If the temperature is <190°F (87.8°C), press RE SET to confirm the resistance of the temperature sensor.
Fault state before start
41
Started more than 8 times in the past 12 hours
Subject to 8 start/12 hour counter limits, press the RESET button to force a start.
Fault state before start
42
Cooling water volume cannot be established
Check the water pump, power supply and pilot wire appliance, check the water flow switch, check the water valve and check if there is air in the water view.
Fault state before start
43
Ice water volume cannot be established
Check the water pump, power supply and pilot wire appliance, check the water flow switch, check the water valve and check if there is air in the water view.
Fault state before start
44
Oil pump pressure switch problem
When the oil pump is not open, the oil pressure switch contact is the path (CLOSED), check the contact and switch settings.
Fault state before start
45
Temperature sensor (Sensor) reading out of range
Perform a control test to check if the setpoint potentiometer is damaged, if the temperature sensing rod is open or shorted, and confirm the contact and switch setting.
Fault state before start
46
The oil pressure switch is not connected within 15 seconds after the oil pump is started (cannot be established)
Check the oil pump power, oil level and oil pressure switch settings to check if the oil filter is too dirty.
Fault state before start
48
Voltage too high / low
The control center supply voltage <94.3VAC or >135.5VAC lasts for more than a minute. Check the control center transformer, circuit load, if the voltage is indeed too low, you should inform the power company and try to improve. Please refer to I/OBoard replacement.
Host trip status
56
The secondary compressor is not normal (dual-type freezer)
The safety switch of the sub-compressor exceeds the limit value (press the sub-compressor status button to display the fault code)
Host trip status
60
Compressor exhaust temperature >220°F
Check the exhaust temperature immediately, measure the resistance of the sense bar, check the flow and temperature of the cooling water, check the temperature of the tank, and check if the condenser leaks air or moisture.
Host trip status
61
Evaporator refrigerant temperature <limit value
Check the refrigerant temperature, the temperature of the temperature bar, and check the amount of refrigerant.
Host trip status
62
Motor coil temperature >220°F (104°C) 190°F (88°C) reset
Check the motor temperature immediately, measure the resistance of the temperature sensing bar and the connector of the junction box on the compressor, and check if the motor cooling system is not well cooled.
Host trip status
63
Thrust bearing temperature >220°F (104°C)
Check the tank temperature, check the oil cooler water volume and solenoid valve, check the oil heater temperature switch setting value, measure the temperature sensing rod resistance value and the connector of the junction box on the compressor. If there is no abnormality in the above items, check the head shaft. And thrust bearings.
Host trip status
64
Temperature sensing rod (SENSOR) reading is out of range
Perform a control test to check if the setpoint potentiometer is damaged, if the temperature sensing rod is shorted or shorted, and confirm the resistance of the temperature sensing rod. Check that the motor current signal disappears when the compressor starts. Check the diffusion wall feedback potentiometer calibration point.
Host trip status
65
Oil pressure <limit value
Check the oil pump power supply, oil level oil pressure switch setting value, check if the oil filter net is too dirty, confirm whether there is foaming of the frozen oil at startup, if any, slow down the rate of Ramp Loading
Host trip status
66
Motor overload relay trip
Check the motor overload relay delay oil only and set value (do not be corrected in the field), check the motor current demand correction point, check the compressor motor starter other protection equipment (such as: under-phase, grounding protection, etc.) and then start Check the motor for the same open circuit or ground protection before
Host trip status
67
Instant power outage
The control center voltage <57.5VAC lasts for more than one-sixth of a second and press the RESET button to restart.
Host trip status
68
Voltage is too low
The control center power supply voltage <94.3VAC lasts for more than one minute. Check the control center transformer, circuit load, if the voltage is indeed too low, you should inform the power company and try to improve
Host trip status
69
The voltage is too high
The control center supply voltage >135.7VAC lasts for more than a minute. Check the control center voltage and transformer. If the voltage is indeed too high, notify the power company and try to improve it.
Host trip status
70
Insufficient ice water flow
Check the pilot relay, check the pump power supply, check the water flow switch and the water stop valve
Host trip status
71
Insufficient flow of condensate
Check the pilot relay, check the pump power supply, check the water flow switch and the water stop valve
Host trip status
72
Shorted jumper (Jumper)
Check the short circuit of the ground
Host trip status
73
Condenser pressure is too high
Check condenser pressure switch setting, check condensate flow and temperature, check if condenser copper tube is dirty
Host trip status
74
The starter cannot be switched to the delta connection
Check the starter, check the RUN contact, check the configuration of the DIP switch and whether the starter type matches
Host trip status
75
Motor acceleration time is too long
Check if the door is closed at startup, confirm the starter switching time, and check the door linkage. Check that the configuration of the dial and the type of starter match.
Host trip status
76
Dip switch configuration error
Confirm the position of the dip switch setting
Host trip status
77
The “Run/Switch” contact can be turned off when the machine is stopped.
Check the running contact, check the 1CR relay, and check if the starter contact is stuck.
Host trip status
78
Manual shutdown
When the L/R switch is placed in the "REMOTE" position, the "STOP" button is pressed and reset.
Host trip status
79
Alternate safety protector action
Check the alternate safety protector contacts and check that the alternate safety protector is functioning properly.
Host trip status
80
Recirculation operation with motor current >65% RLA
Check the ice water, condensate flow rate and temperature are normal, check the resistance value of the ice water / brine water temperature sensor, check the motor current correction point is correct, check the door motor and connecting rod.
Host trip status
81
Communication interruption
The communication tube of the freezer control center and ESP has not been established or established and is interrupted for more than 15 seconds. Please see the ESP operating instructions
Host trip status
85
Sub Compressor Diffusion Wall Abnormal (Double Model
The position of the secondary compressor diffuser wall is not within the allowable range. Please check the action of the solenoid valve.
Host trip status
87
Starter RUN contact open circuit during freezer operation
Check the starter, check the RUN contact, and check the field wiring connector.
Host trip status
88
The sub-compressor surge protection function makes the freezer jump
Check the body for leaks or the copper tube is too dirty. Check the air guide door / door motor and connecting rod.
——
Ice water temperature is too high (freezer is running)
The thermostat set point is too high - reset the thermostat.
Capacity Override or freezing load is too large (the freezer is running at the rated tonnage)--Check the fault number to check if the outside air leaks into the house.
The condenser temperature is too high--check the condensate flow rate, check the condensate temperature; check the cooling tower operation, check for air leakage or water leakage, and check if the condenser copper tube is too dirty.
The refrigerant is too low - check leaks and leaks, add refrigerant and adjust the amount of perfusion.
Short circuit of water flow in the water tank - check the partition plate and gasket for leaks.
The door cannot be opened - check the door motor for damage and replace it if it is damaged.
The door cannot be fully opened - confirm that the capacity control switch is in the "AUTO" position. If the "INC" door still cannot be opened, please confirm if the freezing load is too large (see above). Check the resistance of the ice water or brine temperature bar. Check the door linkage, check the start switch in the door, and check that the sensor is connected to the appropriate terminal.
The sub-compressor is not started as required (dual compressor freezer) - check the status of the sub-compressor (STATUS) to check if the conditions for starting the sub-compressor are met.
——
Ice water or brine temperature is too low (freezer is running)
The door cannot be closed - confirm that the capacity control switch is in the "AUTO" position. Check the resistance value of the ice water or salt water temperature sensor, check the door connecting rod, check if the door motor is damaged, replace it if it is damaged, and check if the sensor is connected to the appropriate terminal.
The temperature sensing rod is damaged, check the resistance of the temperature sensing rod.
The evaporator refrigerant temperature switch is not set properly (in the case of salt water). Check the refrigerant temperature set point.
The thermostat set point is too low to reset the thermostat.
——
Ice water temperature fluctuates up and down; the door has a hunting phenomenon
The deadband is too narrow (flow or temperature is unstable) and the pullband configuration Deadband is set to 2°F (1°C).
The Proprtional Band is too narrow (flow or temperature instability) and the switch configuration Proporti onal Band is set to 15°F (8.3°C)
The door connecting rod is loose - adjust the door connecting rod.
Door motor damage - replace the door motor.
Damage to the temperature sensing rod - replace the temperature sensing rod.
——
Tank temperature is too low
The amount of water in the oil cooler is too large - adjust the amount of water
The temperature switch set point is not appropriate or damaged - the voltage between the temperature switch terminals is measured during the adjustment. If the contacts are not connected, the temperature switch should be replaced.
The oil heater is damaged. If the indicator power is turned on but the heater is not heated, check if the heater is open or shorted and replace if necessary.
——
Tank temperature is too high
The oil cooler is too small - turn on the adjusted water volume.
Temperature switch set point is incorrect - readjust the set point
The oil cooler solenoid valve does not operate normally. Check the action of the solenoid valve coil and check the valve body. If the filter is dirty, clean it and install a 20 mesh (MESH) filter in front of the valve body.
The oil cooler coil is too dirty, clean the coil and replace if necessary.
——
The refrigerant has disappeared a lot
The number of operation of the eliminator pump is too frequent, and the part of the ejector that operates too frequently in the "AUTO" position
——
The ejector does not operate in the "AUTO" position
Under normal circumstances, the pressure of the eliminator must be within 2-4Psi (14-28Kpa) of the condenser pressure, and the eliminator pump will run. Check the pressure gauge reading for the operation of the exhaust system.
The fuse is blown. (On some hosts) Check the 15 amp protection in the ejector switch box
