Carrier Aqua SNAP PLUS Manuel D'installation page 20

System test
GMC Board Alarm Codes
There is an LED on the GMC board that displays any board
errors. The error code can be identified from the flashing
LED using the following table. In the case of more than one
error, the error with the highest priority will be displayed
until it is resolved.
In the case of normal operation, the LED flashes at a
frequency of ½ Hz. In the case of an error, the LED remains
off for 4 seconds, then at a frequency of 1Hz, it flashes a
number of times equal to the error code and than remains
off again for 6 seconds. If the error code has 2 digits, the
flashing is interrupted for 2 seconds between the first and
second digits.
Fault Code Description
3 Enter water Temperature Thermistor (EWT)
4 Actual Refrigerant Temperature Thermistor BPHE
5 Air Thermistor of GMC
6 Loss communication to NUI control
7 NUI control Room Thermistor
8 Unit Capacity Mismatch
9 Flow Switch error / Water Pump
10 EEProm Corrupt
11 Air temperature higher than Stop Heat
12 Air temperature lower than Stop Cool
13 Loss Communication to RS485 (system configuration type 6)
14 Loss of Signal From inverter board
15 Exit water Temperature Thermistor (LWT)
17 Inverter Air Thermistor (TO)
18 G-Tr inverter short circuit protection
20 Compressor position Detection Circuit error
21 Inverter Current Sensor error
22 Heat Exchanger Sensors (TE) / (TS)
23 Discharge Temperature Sensor (TD)
24 Outdoor Fan motor error
26 Other inverter board error
27 Compressor Lock
28 Discharge Temperature error
29 Compressor Breakdown
30 Other inverter board error
31 High Temperature Release
Board position
Fig. 16
Legend:
A Position 4 LED Inverter Diagnostics Board (38AWH012_ only)
B Position LED GMC Diagnostics Board
C Installation terminal strip
12 30AW
Example: error 23: LED off for 4 seconds. 2 flashes at a
frequency of 1Hz. Off for 2 seconds. 3 flashes at a frequency
of 1Hz. Off for 6 seconds. The cycle repeats until the LED
turns off because the problem is resolved or if an error with
higher priority occurs.
(Fig. 16)