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Operational and connection information
Fault Code Table
Fault Code Fault
3 Enter water Temperature Thermistor (EWT)
4 Actual Refrigerant Temperature Thermistor BPHE
5 Outdoor Air Thermistor of GMC
6 Loss communication to NUI
7 NUI Room Thermistor
8 Unit Capacity Mismatch
9 Flow Switch error / Water Pump
10 EEPROM Corrupt
11 OAT high than Stop Heat
12 OAT low than Stop Cool
13 Loss Comm to RS485 (system conguration type=6)
14 Loss of Signal From CDU
15 Leaving Water Temperature Thermistor (LWT)
17 CDU Outdoor Air Thermistor (TO)
18 G-Tr short circuit protection
20 Position Detection Circuit Error
21 Current Sensor Error
22 Outdoor Heat Exchange Sensor (TE) / (TS)
23 Discharge Temperature Sensor (TD)
24 Outdoor Fan Error
26 Other Outdoor Error
27 Compressor Lock
28 Discharge Temperature Error
29 Compressor Breakdown
30 Low Pressure Switch
31 High Pressure Release
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