Error
Code
Description
Indoor Unit LED Display
C1
Current arch protection
Running LED-Off 3S, Blinks 12 times
C2
Current leakage protection
Running LED-Off 3S, Blinks 13 times
C3
Mis-wiring protection
Running LED-Off 3S, Blinks 14 times
C5
Jumper error protection
Running LED-Off 3S, Blinks 15 times
C6
No-ground
Running LED-Off 3S, Blinks 16 times
Cd
Too much CO2 protection
TBD
CF
Current short-cut protection
TBD (Buzzer will sound once every 2 sec.)
d1
WSHP: UV light error
TBD
E0
Commercial: Water pump overload/error/flow switch error
Running LED-Off 3S, Blinks 10 times
E1
System high pressure protection
Running LED-Off 3S, Blinks 1 time
E2
Anti-freezing protection (heat exchanger-ID, OD)
Running LED-Off 3S, Blinks 2 times
E3
Low pressure protection (run cooling when OD is too cold)
Running LED-Off 3S, Blinks 3 times
E4
Compressor dischage pressure too high
Running LED-Off 3S, Blinks 4 times
E5
System/compressor current too high
Running LED-Off 3S, Blinks 5 times
E6
Communication error (ID-OD)
Running LED-Off 3S, Blinks 6 times
E7
Mode clash (some ID runs cooling/fan, some runs heating
Running LED-Off 3S, Blinks 7 times
EA
VRF: Oil valve protection
TBD
Ec
Commercial & VRF: Water flow protection (lack of water flow)
TBD
Ed
System temperature too high
TBD
EE
Memory chip error (U5)
Heating LCD-Off 3S, Blinks 15 times
EF
Outdoor fan motor overload
TBD
EL
Fire alarm
TBD
EP
Shell top high temperature protection
TBD
F0
System refrigerant lack or restriction protection
Cooling LED-Off 3S, Blinks 10 times
F3
Outdoor abmient temperature sensor error
Cooling LED-Off 3S, Blinks 3 times
F8
Incoming water temperature sensor error
Cooling LED-Off 3S, Blinks 8 times
F9
Outgoing water temperature sensor error
Cooling LED-Off 3S, Blinks 9 times
FA
Oil temperature sensor error
TBD
Fd
Suction gas temperature sensor error
TBD
FE
User side water sensor error
TBD
FL
Water tank-middle sensor error
TBD
FP
CO2 checking error
TBD
FU
Shell top temperature sensor error protection
TBD
H1
Heating-Defrosting, or oil return
TBD
H2
Static electric de-dust protection
Heating LED-Off 3S, Blinks 2 times
H3
Compressor over-temperature protection
Heating LED-Off 3S, Blinks 3 times
H4
System abnormal (many different other reasons…)
Heating LED-Off 3S, Blinks 4 times
H5
IPM abnormal / Control M odule Protection
Heating LED-Off 3S, Blinks 5 times
H6
Indoor fan motor-no feedback
Running LED-Off 3S, Blinks 11 times
H7
Comopressor loses steps, not being able to check rotor position
Heating LED-Off 3S, Blinks 7 times
HC
PFC board abnormal / PFC protection
Heating LED-Off 3S, Blinks 6 times
HE
Compressor de-managet protection (rotor locked /doesn't rotate)
Heating LED-Off 3S, Blinks 14 times
L0
Airflow switch error
TBD
L1
Humidity sensor error
TBD
L2
Water level switch error / hot water tank level switch error
TBD
L3
Outdoor DC motor error (L3 for dual -mtor 1, LA for motor 2)
Running LED-Off 3S, Blinks 23 times
L4
Filter clogged
TBD
L5
Circulating water temperature sensor error
TBD
L6
System capacity insufficient
TBD
L7
Water pressure switch protection
TBD
Lc
Starting failure
Heating LED-Off 3S, Blinks 11 times
Ld
Power phase loss/lack
TBD
LE
Compressor locked
Running LED-Off 3S, Blinks 22 times
LF
Compressor over-speed protection
TBD
LH
Indoor ambient temperature too high
TBD
LL
Indoor ambient temperature too low
TBD
LP
Indoor-Outdoor units don't match or power line connection error
Running LED-Off 3S, Blinks 19 times
P0
Driving module resumed
TBD
P5
Driving board checking-compressor current too high
Heating LED-Off 3S, Blinks 15 times
P6
Driving board checking-communication error with indoor board
Heating LED-Off 3S, Blinks 16 times
P7
Radiator loose, or IPM /PFC board sensor abnormal /error
Heating LED-Off 3S, Blinks 18 times
P8
Radiator loose, or IPM /PFC board too hot
Heating LED-Off 3S, Blinks 19 times
P9
AC contactor protection
TBD
PA
AC current protection (incoming)
TBD
Pc
Current checking-circuit error or current sensor error
TBD
P37 OF 44
P38 OF 44
YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World !
YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World !
ERROR AND PROTECTION CODE SUMMARY
ERROR AND PROTECTION CODE SUMMARY
Notes
:
1.Some codes are not malfunctions and will not require you to do anything, since the unit will resume normal
functions once the unit finishes its designated work such as defrost, oil return...
2.Some other codes denote malfunctions and the unit will not resume normal functions until your technician
checks your unit and fixes the problems such as dirty coils, clogged filters, bad control boards...You can
have your technician to call 866-833-3138 for help of technical support and trouble-shoot.
Notes
:
1.Some codes are not malfunctions and will not require you to do anything, since the unit will resume normal
functions once the unit finishes its designated work such as defrost, oil return...
2.Some other codes denote malfunctions and the unit will not resume normal functions until your technician
checks your unit and fixes the problems such as dirty coils, clogged filters, bad control boards...You can
have your technician to call 866-833-3138 for help of technical support and trouble-shoot.
UNIT MAINTENANCE &
SER
VICE GUIDE
UNIT MAINTENANCE &
SER
VICE GUIDE
