Alarm Codes - Carrier PRO-DIALOG Plus 30GK Series Installation, Operation & Maintenance Instructions Manual

6.4 - Alarm codes

The following list gives a complete description of each alarm
code and its possible cause.
ALARM CODE DESCRIPTIONS
Code Alarm name
1 Evaporator leaving water thermistor fault
2 Evaporator entering water thermistor fault
3 Condenser leaving water thermistor fault
4 Condenser entering water thermistor fault
5 Heat reclaim entering water thermistor fault
6 Heat reclaim leaving water thermistor fault
7 Outdoor temperature sensor fault
8 CHWS (master/slave) fluid thermistor fault
9 Suction thermistor fault, compressor A1
10 Suction thermistor fault, compressor B1
11 External 0-10 V dc signal fault
12 Discharge pressure sensor fault, circuit A
13 Discharge pressure sensor fault, circuit B
14 Suction pressure sensor fault, circuit A
15 Suction pressure sensor fault, circuit B
16 Oil pressure sensor fault, compressor A1
17 Oil pressure sensor fault, compressor B1
18 Oil pressure sensor fault, compressor A2
19 Oil pressure sensor fault, compressor B2
20 Oil pressure sensor fault, compressor A3
21 Oil pressure sensor fault, compressor B3
22 Oil pressure sensor fault, compressor A4
23 Oil pressure sensor fault, compressor B4
24 Pumpdown pressure sensor fault, circuit A
25 Pumpdown pressure sensor fault, circuit B
26 Loss of communication with compressor board A1
27 Loss of communication with compressor board A2
28 Loss of communication with compressor board A3
29 Loss of communication with compressor board A4
30 Loss of communication with compressor board B1
31 Loss of communication with compressor board B2
32 Loss of communication with compressor board B3
33 Loss of communication with compressor board B4
34 Loss of communication with EXV board
35 Loss of communication with NRCP board
36 Loss of communication with fan board 1
37 Loss of communication with fan board 2
38 Loss of communication with 4xAI - 2xAO board 1
39 Loss of communication with 4xAI - 2xAO board 2
40 Pumpdown fault, circuit A
41 Pumpdown fault, circuit B
42 Evaporator frost protection
43 Low evaporator water flow rate.
44 Low suction temperature, circuit A
45 Low suction temperature, circuit B
46 High suction overheat, circuit A
47 High suction overheat, circuit B
48 Low suction overheat, circuit A
Description Action
Thermistor outside range Unit shut down
Ditto Unit shut down
Ditto Heating mode: Unit shut down,
if control on leaving water.
Cooling mode: no action
Ditto Heating mode: Unit shut down,
if control on entering water.
Cooling mode: no action
Ditto Unit with heat recalaim option:
heat reclaim mode shut down,
unit changes over to standard
cooling mode. If not: no action
Ditto None
Ditto Reset: normal setpoint used.
Limitation or reset deactivated.
Ditto Deactivated
Ditto Circuit A shut down
Ditto Circuit B shut down
Reset signal outside range Reset: normal setpoint used
Limitation or reset deactivated
Voltage transmitted by incorrect sensor Circuit A shut down
Ditto Circuit B shut down
Ditto Circuit A shut down
Ditto Circuit B shut down
Ditto Circuit A shut down
Ditto Circuit B shut down
Ditto Compressor A2 shut down
Ditto Compressor B2 shut down
Ditto Compressor A3 shut down
Ditto Compressor B3 shut down
Ditto Compressor A4 shut down
Ditto Compressor B4 shut down
Ditto If circuit is in heat reclaim
mode, it goes to cooling mode.
If not, no action
Ditto Ditto
Communication with the compressor Circuit A shut down
board is lost
Ditto Compressor A2 shut down
Ditto Compressor A3 shut down
Ditto Compressor A4 shut down
Ditto Circuit B shut down
Ditto Compressor B2 shut down
Ditto Compressor B3 shut down
Ditto Compressor B4 shut down
Ditto Unit shut down
The board does not respond Unit shut down, if heat reclaim mode No
is selected
Ditto Unit shut down, if the number of
fan stages per circuit is less than 3.
If not, circuit A shut down
Ditto Circuit B shut down
Ditto Unit shut down or no action
Ditto Compressors or circuit shut down
End of pumpdown conditions not Circuit A shut down
satisfied
Ditto Circuit B shut down
Unit operating: units shut down if Unit shut down
temp. < defrost threshold.
Unit shut down: if temp < threshold
and evaporator heater on for more
than 10 mins.
Unit shut down
Circuit operating: saturated suction Circuit A shut down
temp. < defrost threshold and < leaving
water -16°C for more than 10 mins.
Ditto Circuit B shut down
EXV fully open Circuit A shut down
Ditto Circuit B shut down
EXV in min. position, and circuit Circuit A shut down
superheat below superheat setpoint
-5.5 K, saturated suction temp. above
MOP for 5 mins.
Pumpdown Reset type Probable cause
Yes Auto Thermistor or wiring fault or
bad connection
Yes Auto Ditto
Yes Auto Ditto
- Auto Ditto
- Auto Ditto
- Auto Ditto
- Auto, if temp. mea- Thermistor faulty
sured by sensor
returns to normal
- Ditto Themistor faulty
Yes Auto Ditto
Yes Auto Ditto
No Auto Signal incorrect, wiring error
Yes Auto Sensor fault or wiring error
Yes Auto Ditto
No Auto Ditto
No Auto Ditto
No Auto Ditto
No Auto Ditto
- Auto Ditto
- Auto Ditto
- Auto Ditto
- Auto Ditto
- Auto Ditto
- Auto Ditto
- Auto, if press. mea-
sured by sensor
returns to normal
- Ditto Ditto
No Auto Wiring fault, faulty module,
incorrect module address
No Auto Ditto
No Auto Ditto
No Auto Ditto
No Auto Ditto
No Auto Ditto
- Auto Ditto
- Auto Ditto
No Auto Wiring bus faulty, incorrect
address or board faulty
Auto, if board is NRCP board faulty
again detected
No Auto Wiring bus faulty, incorrect
address or board faulty
No Auto Ditto
No Auto Ditto, depending on
configuration
No Auto Ditto, depending on
configuration
No Manual EXV or sensor faulty
No Manual Ditto
No Auto first time, Low water flow or
then manual thermistor defective
No Manual Water pump faulty
No Manual Low charge, filter dirty
ot thermistor faulty
No Manual Ditto
Yes Manual Ditto
Yes Manual Ditto
Yes Manual EXV or thermistor or
transducer defective
33