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ALARM CODE DESCRIPTIONS
Alarm Description Why was this alarm Action taken Reset type Probable cause
code generated? by the control
1 Evaporator entering fluid thermistor failure Thermistor outside range -40 to 118°C Unit shut down Automatic Thermistor or wiring fault
2 Evaporator leaving fluid thermistor failure Thermistor outside range -40 to 118°C Unit shut down Automatic Ditto
3 Condenser entering fluid thermistor failure Thermistor outside range -40 to 118°C None, simple message Automatic Thermistor or wiring fault or cable/wire
damaged
4 Condenser leaving fluid thermistor failure Thermistor outside range -40 to 118°C None in cooling mode Automatic Ditto
Unit shut down in heating mode
5 Heat reclaim condenser entering fluid thermistor failure Thermistor outside range -40 to 118°C None, simple message Automatic Ditto
6 Heat reclaim condenser leaving fluid thermistor failure Thermistor outside range -40 to 118°C None, simple message Automatic Ditto
7 Discharge gas thermistor failure, circuit A Thermistor outside range -40 to 118°C Circuit A shut down Automatic Thermistor solenoid, motor cooling or
wiring fault or high discharge temperature
8 Discharge gas thermistor failure, circuit B Thermistor outside range -40 to 118°C Circuit B shut down Automatic Ditto
9 Motor sensor compressor A1 Thermistor outside range -40 to 118°C Compressor A1 shut down Automatic Thermistor, solenoid, motor cooling
or wiring fault
10 Motor sensor compressor A2 Thermistor outside range -40 to 118°C Compressor A2 shut down Automatic Ditto
11 Motor sensor compressor B1 Thermistor outside range -40 to 118°C Compressor B1 shut down Automatic Ditto
12 Motor sensor compressor B2 Thermistor outside range -40 to 118°C Compressor B2 shut down Automatic Ditto
13 External 0-10 V dc signal fault Signal ouside range 1- Loadshed: not used Automatic Defective input or wiring fault
2- Demand limit: deactivated
14 Discharge pressure transducer failure, circuit A Measured signal = 0V dc Circuit A shut down Automatic Defective transducer, wiring fault
15 Discharge pressure transducer failure, circuit B Measured signal = 0V dc Circuit B shut down Automatic Ditto
16 Suction pressure transducer failure, circuit A Measured signal = 0V dc Circuit A shut down Automatic Ditto
17 Suction pressure transducer failure, circuit B Measured signal = 0V dc Circuit B shut down Automatic Ditto
18 Oil pressure transducer failure, compressor A1 Measured signal = 0V dc Compressor A1 shut down Automatic Ditto
19 Oil pressure transducer failure, compressor A2 Measured signal = 0V dc Compressor A2 shut down Automatic Ditto
20 Oil pressure transducer failure, compressor B1 Measured signal = 0V dc Compressor B1 shut down Automatic Ditto
21 Oil pressure transducer failure, compressor B2 Measured signal = 0V dc Compressor B2 shut down Automatic Ditto
22 Economizer A1 transducer failure Measured signal = 0V dc Circuit A shut down for unit Automatic Ditto
with economizer. Otherwise
compressor A1 shut down.
23 Economizer A2 transducer failure Measured signal = 0V dc Compressor A2 shut down Automatic Ditto
24 Economizer B1 transducer failure Measured signal = 0V dc Circuit B shut down for unit Automatic Ditto
with economizer. Otherwise
compressor B1 shut down.
25 Economizer B2 transducer failure Measured signal = 0V dc Compressor B2 shut down Automatic Ditto
26 Transducer supply defective Ref. voltage supplied by main board Unit shut down Automatic Basic board failure or wiring fault
outside range 4,4 V-5,5 V
27 Evaporator liquid level sensor failure, circuit A Sensor reading outside range Circuit operates, but EXV Automatic Open thermistor, liquid level sensor
-40 to 118°C control based on discharge defective, wiring fault
superheat
28 Evaporator liquid level sensor failure, circuit B Sensor reading outside range Ditto Automatic Ditto
-40 to 118°C
29 Loss of communication with CPM A1 board CPM A1 board does not respond Compressor A1 shut down Automatic Bus wiring fault, incorrect address
or defective board
30 Loss of communication with CPM A2 board CPM A2 board does not respond Compressor A2 shut down Automatic Ditto
31 Loss of communication with CPM B1 board CPM B1 board does not respond Compressor B1 shut down Automatic Ditto
32 Loss of communication with CPM B2 board CPM B2 board does not respond Compressor B2 shut down Automatic Ditto
33 Loss of communication with 4xDO #1 board 4xDO board associated with Circuit A shut down Automatic Ditto
CPM A1 does not respond
34 Loss of communication with 4xDO #2 board 4xDO board associated with Compressor A2 shut down Automatic Ditto
CPM A2 does not respond
35 Loss of communication with 4xDO #3 board 4xDO board associated with Circuit B shut down Automatic Ditto
CPM B1 does not respond
36 Loss of communication with 4xDO #4 board 4xDO board associated with Compressor B2 shut down Automatic Ditto
CPM B2 does not respond
37 Loss of communication with EXV board, circuit A 4xDO board controlling EXV Circuit A shut down Automatic Ditto
circuit A does not respond
38 Loss of communication with EXV board, circuit B 4xDO board controlling EXV Circuit B shut down Automatic Ditto
circuit B does not respond
39 Loss of communication with fan board #1 4xDO board controlling the first four Unit shut down if number of Automatic Ditto
fan stages does not respond fan stages by circuit is lower
than three. Otherwise circuit A
shut down.
40 Loss of communication with fan board # 2 4xDO board controlling the fan Circuit B shut down Automatic Ditto
stages of circuit B does not respond
41 Loss of communication with 4xAI - 2xAO #1 board Analogue card does not respond Unit shut down if operating in Automatic Ditto
heating mode or using the speed
controller or water valve. Other-
wise simple message. EXV
controls superheat, and no longer
controls based on level indicator
42 Loss of communication with 4xAI - 2xAO #2 board Analogue card does not respond Unit shut down if economizer Automatic Ditto
is used. Otherwise only
compressors A1 + B1 are
shut down.
43 Loss of communication with 4xAI - 2xAO #3 board Analaogue board does not respond Shut down compressor A2 & B2 Automatic Ditto
44 Discharge pressure circuit A too high SCT>loadshed threshold. Max. satur. Circuit A shut down Automatic in the Transducer/high pressurestat or fan circuit
condensing pressure (mct_sp) 10 minutes that defective, condenser water flow restricted.
if only one capacity stage remains follow condenser entering water or air temperature
in operation. too high
45 Discharge pressure circuit B too high SCT>loadshed threshold. Max. satur. Circuit B shut down Automatic in the Ditto
condensing pressure (mct_sp) 10 minutes that
if only one capacity stage remains follow
in operation.
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