16
What If !
Fault Code Table
NUI will read Main Board Failures through one of the
communication parameters (Parameter 22). When entered
into user setup and scroll the parameters to number 22, NUI
will display active fault codes mentioned in below table.
These active fault codes will be displayed in a sequence,
with the change rate of 1 second.
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 Communication 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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