Carrier AquaSnap Plus 30AWH004HB Installation Manual page 22

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
Fault
Description
Code
2 Safety Input
3 Enter water Temperature Sensor (EWT)
4 Actual Refrigerant Temperature Sensor (TR)
5 Outdoor Air Sensor of GMC
6 Loss communication to NUI control
7 NUI control Room Sensor
9 Flow Switch error / Water Pump
10 EEProm Corrupt
13 Loss Communication to RS485 (system configuration type 6)
14 Loss of Signal From inverter board or High Temperature Release
15 Exit water Temperature Sensor (LWT)
16 Alarm Test
17 Inverter Air Sensor (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 unit error
27 Compressor Lock
28 Discharge Temperature error
29 Compressor Breakdown
14 30AWH
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.
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)