10.7 4TXK6518G1000AA failure code
PCB
Indoor
display
Contents of Malfunction Diagnosis and Analysis
1 F1 EEPROM fault EEPROM chip damaged or data fault
2 F2 IPM protection Input overcurrent occured been detected by PIM hardware
4 F4
Communication between
main board and power
module
Communication fail over 4 min
5 F5 High pressure protection System high pressure over 4.15Mpa
6 F6
Power module over/lack-
voltage protection
Send from power module
8 F8
Compressor Td temp.
protection
Compressor Td temp. over 110°C
9 F9
DC fan motor fault Jam of DC motor or motor fault
10 F10
Abnormal of coil sensor Coil sensor short-circuit or open-circuit
11 F11
Suction temperature sensor Suction temperature sensor short-circuit or open-circuit or the
failure compressor connection is poor
12 F12
Outdoor ambient sensor
fault
Outdoor ambient sensor short-circuit or open-circuit
13 F13 Compressor Td sensor fault Compressor Td sensor short-circuit oropen-circuit
15 F15
Communication between
indoor and outdoor unit
Communication fail over 4min
16 F16
Lack of refrigerant Check if there is leakage in the unit
17 F17 4-way valve reverse failure
Alarm and stop if detect Td-Tci≤15 last for 1 min after
compressor has started for 10 min in heating mode, confirm the
failure if it appears 3 times in one hour.
18 F18 Compressor jam Compressor jamed internally
19 F19
Power module PWM select
circuit fault
Power module PWM selects wrong circuit
25 F25
Compressor U-phase over-
current
The current of compressor U-phase is too high
25 F25
Compressor V-phase over-
current
The current of compressor V-phase is too high
25 F25
Compressor W-phase over-
current
The current of compressor W-phase is too high
148
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