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Alarm CodeCauseComponentsTroubleshooting

Corrective Actions

2

AL05 Manual Defrost Switch Failure

Controller has detected continuous Manual Defrost Switch activity for five minutes or more.

KeypadPower cycle the unit.

Resetting the unit may correct problem, monitor the unit. If the alarm reappears after 5 minutes replace the keypad.

3

AL06 Keypad or Keypad Harness Fail

Controller has detected one of the keypad keys is continuously activity.Keypad or HarnessPower cycle the unit.

Resetting the unit may correct problem, monitor the unit. If the alarm reappears replace the keypad and harness.

4

AL07 Fresh Air Vent Open with Frozen Set Point

The VPS is reading greater than 0 CMH while unit is in frozen mode.Vent Position Sensor (VPS)

Manually reposition vent and confirm using Cd45. Refer to VENT POSITION SENSOR SERVICE Section 6.25.

If unable to obtain zero reading, replace defective VPS.

5

AL10 CO2 Sensor Failure

Alarm 10 is triggered when the CO2 sensor voltage is operating outside of the 0.9 v to 4.7 v range, or if the sensor is out of range.

This is a display alarm and has no associated failure action.

Refer to eAutoFresh manual.

The alarm is triggered off when voltage is within operating range.

6

AL11 Evaporator fan 1 IP

Alarm 11 is triggered when configured for single evap operation and MC6 sensed high.

Evaporator Fan 1

The unit will suspend probe check diagnostic lo- gic and disable the probe check portion of defrost cycle.

AL11 is triggered off when MC6 sensed low.

7

AL12 Evaporator fan 2 IP

Alarm 12 is triggered when configured for single evap operation and KB10 sensed high.

Evaporator Fan 2

The unit will suspend probe check diagnostic lo- gic and disable the probe check portion of defrost cycle.

AL11 is triggered off when KB10 sensed low.

8

AL15 Loss of cooling

Unit fails to achieve 0.25C temperature delta for eight minutes before a probe−check defrost and then fails again for thirty minutes after the probe−check.

N/APower cycle the unit.

Resetting the unit may correct problem, monitor the unit.

9

AL20 Control Contactor Fuse (F3)Control power fuse (F3A or F3B) is open.

Check F3A, if the fuse is open:

Check PA, PB, CH coils for short to ground, if short is found:

Replace the defective coil. Replace the fuse.

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Check F3B, if the fuse is open:

Check ESV coil resistance at TP7 to TP9, if short to ground, or if resistance is less than 4 ohms, coil is defective. Check CF, ES, EF, HR coils for short to ground, if short is found, coil is defective.

Replace the defective coil. Replace the fuse.

11

Check Voltage at QC1:

If voltage is present, it indicates a defective microprocessor.

Refer to Controller Service Section 6.23.

12

AL21 Control Circuit Fuse (F1/F2)One of the 18 VAC controller fuses (F1/F2) is open. Refer to Cd08.System Sensors

Check system sensors for short to ground.

Replace defective sensor(s)

13

Wiring

Check wiring for short to ground.

Repair as needed.

14

Controller

Controller may have an internal short.

Replace controller, refer to Controller Service Section 6.23.

15

AL22 Evaporator IPEvaporator motor internal protector (IP) is open.Evaporator Motor

Shut down unit, disconnect power, & check Evaporator Motor IP at plug connection pins 4 & 6.

Replace defective evaporator fan motor, refer to EVAPORATOR FAN MOTOR Service Section 6.16.

16

AL23 Loss of Phase B

Controller fails to detect current draw.Incoming Power

Check incoming power source.

Correct power source as required.

17

AL24 Compressor IP

Compressor internal protector (IP) is open.Compressor

Shut down unit disconnect power, & check resistance of compressor windings at contactor T1−T2, T2−T3.

Monitor unit, if alarm remains active or is repetitive replace the compressor at the next available opportunity, refer to COMPRESSOR Service Section 6.8.

18

AL25 Condenser IPCondenser fan motor internal protector (IP) is open.Insufficient Air Flow

Shut down unit and check condenser fan for obstruc- tions.

Remove obstructions.

19

Condenser Fan Motor

Shut down unit, disconnect power, & check Condenser Fan Motor IP at plug con- nection pins 1 & 2.

Replace defective condenser fan motor, refer to Condenser Fan Motor Assembly Service Section 6.11.

20

AL26 All Sensors Failure: Supply/Return ProbesSensors out of range.All sensors. detected as out of rangePerform Pre−trip P5:

If P5 passes, no further action is required.

21

If P5 fails, replace the defective sensor as determined by P5, refer to TEMPERATURE SENSOR Service Section 6.24.

22

AL27 Analog to Digital Accuracy Failure

Controller AD converter faulty.Controller

Power cycle the unit. If the alarm persists, it indicates a defective microprocessor.

Replace defective microprocessor, refer to Controller Service Section 6.23.

23

AL29 AutoFresh Failure

Alarm 29 is triggered if CO2 or O2 level is outside of the limit range and the vent position is at 100% for longer than 90 minutes.

Alarm LED will be activated and user intervention is re- quired.

Refer to eAutoFresh manual.

The alarm is triggered off when atmospheric con- ditions are within limit settings.

24

AL50 Air Vent Position Sensor (VPS)VPS Sensor out of range.Vent Position Sensor (VPS)

Make sure VPS is secure.

Manually tighten panel.

25

If the alarm persists, replace the sensor or the assembly.

Replace VPS.

26

AL51 EEPROM FailureController Memory FailureController

Pressing the ENTER key when “CLEAr” is displayed will result in an attempt to clear the alarm.

If action is successful (all alarms are inactive), AL51 will be reset.

27

Power cycle the unit. If the alarm persists, it indicates defective controller memory.

Replace defective controller, refer to Controller Service Section 6.23

28

AL52 EEPROM Alarm List Full

Alarm list queue is full.Active Alarms

Repair any alarms in the queue that are active. Indicated by “AA”.

Clear alarms, refer to CONTROLLER ALARMS Table 3-6.

29

AL53 Battery Pack Failure

Battery voltage lowBattery

If this alarm occurs on start up, allow a unit fitted with rechargeable batteries to operate for up to 24 hours to charge rechargeable batteries sufficiently. Once fully charged, the alarm will deactivate.

To clear the alarm press ENTER and ALT simul- taneously at the startup of Cd19 (Battery Check). If alarm persists, replace the battery pack, refer to Section 6.23.5 Battery Replacement.

30

AL54 Primary Supply Sensor (STS)Invalid Supply Temperature Sensor (STS) reading.Supply Temperature Sensor (STS)Perform Pre−trip P5:

If P5 passes, no further action is required.

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If P5 fails, replace the defective sensor as determined by P5, refer to TEMPERATURE SENSOR Service Section 6.24.

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AL56 Primary Return Sensor (RTS)Invalid Return Temperature Sensor (RTS) reading.Return Temperature Sensor (RTS)Perform Pre−trip P5:

If P5 passes, no further action is required.

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If P5 fails, replace the defective sensor as determined by P5, refer to TEMPERATURE SENSOR Service Section 6.24.

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AL57 Ambient Sensor (AMBS)

Invalid Ambient Temperature Sensor (AMBS) reading.

Ambient Temperature Sensor (AMBS)

Test the AMBS, refer to TEMPERATURE SENSOR Service Section 6.24.

Replace AMBS if defective, refer to TEMPERATURE SENSOR Service Section 6.24.

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AL58 Compressor High Pressure Safety (HPS)High pressure safety switch remains open for at least one minute.

High Pressure Switch (HPS)

Test the HPS; refer to High Pressure Switch, Section 6.9.

Replace HPS if defective, refer to High Pressure Switch, Section 6.9.

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Refrigeration System

Check unit for air flow restrictions.

Clean or remove any debris from coils.

37

AL59 Heater Termination Thermostat (HTT)

Heat Termination Thermostat (HTT) is open.

Alarm 59 is trig- gered by the open- ing of the Heat Ter- mination Thermo- stat (HTT) and will result in the disab- ling of the heater.

Check for 24 volts at test point TP10, if no voltage at TP10 after unit has reached set point HTT is open.

Replace HTT if defective.

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AL60 Defrost Temperature Sensor (DTS)

Failure of the Defrost Temperature Sensor (DTS) to open.

Defrost Temperature Sensor (DTS)

Test the DTS; refer to Sensor Checkout Proced- ure Section 6.24.1.

Replace the DTS if defective, refer to Sensor Replacement Section 6.24.2.

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AL61 Heater Current Draw FaultImproper current draw during heat or defrost mode.Heater(s)

While in heat or defrost mode, check for proper current draw at heater contactors, refer to ELECTRICAL DATA Section 2.3.

Replace heater(s) if defective, refer to Section 6.15.2 Evaporator Heater Removal and Replacement.

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Contactor

Check voltage at heater contactor on the heater side. If no voltage present:

Replace heater contact- or if defective.

41

AL63 Current LimitUnit operating above current limit.Refrigeration System

Check unit for air flow restrictions.

Clean or remove any debris from coils.

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Check unit for proper operation.

Repair as needed.

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Power supply

Confirm supply voltage/fre- quency is within specifica- tion and balanced accord- ing to ELECTRICAL DATA Section 2.3.

Correct power supply.

44

Current limit set too low.

Check current limit setting Code Cd32.

The current limit can be raised (maximum of 23 amps) using Cd32.

45

AL64 Discharge Temperature Sensor (CPDS)

Discharge Temperature sensor out of range.

Discharge temperature sensor (CPDS).

Test the CPDS; refer to TEMPERATURE SENSOR Service Section 6.24..

Replace the CPDS if defective, refer to TEMPERATURE SENSOR Service Sec- tion 6.24.

46

AL65 Discharge Pressure Transducer (DPT)

Compressor Discharge Transducer is out of range.

Compressor Discharge Transducer (DPT)

Confirm accurate DPT pressure readings, refer to MANIFOLD GAUGE SET Section 6.2.

Replace DPT if defective.

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AL66 (SPT) Suction Pressure Transducer, (EPT) Evaporator Pressure TransducerSuction Pressure Transducer (SPT) out of range.Suction Pressure Transducer (SPT)

Confirm accurate EPT and SPT pressure readings, refer to MANIFOLD GAUGE SET Section 6.2. Performing a Pre−trip 5−9 test will also check the transducers.

Replace EPT/SPT if defective.

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Monitor

If the alarm persists, it may indicate a failing compressor, refer to COMPRESSOR Service Section 6.8.

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AL67 Humidity Sensor

Humidity Sensor (HS) reading out of range.Humidity Sensor (HS)

Make sure the humidity sensor is properly connec- ted in the socket and the wires have not been dam- aged.

Monitor, replace HS if alarm persists.

50

AL68 CPC Pressure Sensor (PS3)

Condenser Pressure Transducer (CPC) out of range.

Condenser Pres- sure Transducer (CPC)

NA

Unit will disable Con- denser Pressure Control if Configured.

51

AL69 Suction Temp Sensor (CPSS)

Suction Temperature Sensor (CPSS) out of range.

Suction Temperature Sensor (CPSS)

Test the CPSS, refer to TEMPERATURE SENSOR Service Section 6.24.

Replace CPSS if defective, refer to TEMPERATURE SENSOR Service Section 6.24.

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AL70 Secondary Supply Sensor (SRS)Secondary Supply Sensor (SRS) is out of range.Secondary Supply Sensor (SRS)Perform Pre−trip P5:

If P5 passes, no further action is required.

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If P5 fails, replace the defective sensor as determined by P5, refer to TEMPERATURE SENSOR Service Section 6.24.

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AL71 Secondary Return Sensor (RRS)Secondary Return Sensor (RRS) is out of range.Secondary Return Sensor (RRS)Perform Pre−trip P5:

If P5 passes, no further action is required.

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If P5 fails, replace the defective sensor as determined by P5, refer to TEMPERATURE SENSOR Service Section 6.24.

56

AL72 Control Temp Out of Range

After the unit goes in− range for 30 minutes then out of range for a continuous 120 minutes.

Refrigeration System

Ensure unit is operating correctly.

Power cycle unit. Control Temperature is in In−range. Any Pre−trip mode, re- sets the timers.