P26 OF 36
PROTECTION AND ERROR CODES
Blink once
Twice
E2
Three times
E3
Four times
E4
Five times
E5
Six times
E6
Seven times
E7
fifteen times
C5
Three times
H3
H4
H5
HC
System Unit malfunction
Four times
IPM modular protection-unit stops
Five times
PFC protection-unit stops
Six times
Compressor malfunction
Seven times
Water spill protection
Eight times
Indoor ambient temp. sensor malfunction
Blink once
F1
Indoor pipe temp. sensor malfunction
Outdoor ambient temp. sensor malfunction
Three times
F3
Outdoor pipe temp. sensor malfunction
Four times
F4
Outdoor air exhaust temp. sensor malfunction
Five times
F5
E2 PROM Error
Eleven times
HA
Wire controller ambient temp. sensor malfunction
Twice
F2
Blink once
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
Compressor high pressure protection-unit stops
E1
Meaning
LED
(Red)
LED
(Yellow)
LED
(Green)
Indoor unit anti-freezing protection
Low-pressure protection-unit stops
Air exhaust protection-unit stops
Over current protection-unit stops
Communication malfunction-unit stops
Unit modes conflict
Jumper malfunction
9 Defrosting /Heating oil return
Compressor overload protection-unit stops
Blink once
H1
LED
( )
When the unit is controlled by cabled controller, fault indication and error displays
Fault code
Meaning
Error code display
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
Compressor high pressure protection unit stop
Indoor unit anti-freezing protection
Low-pressure protection unit stop
Air exhaust protection unit stop
Over current protection unit stop
Communication malfunction unit stop
Unit modes conflict
Jumper malfunction
Defrosting /Heating oil return
Compressor overload protection unit stop
System Unit malfunction
IPM modular protection unit stop
PFC protection unit stop
Compressor malfunction
Water spill protection
Indoor ambient temp. sensor malfunction
Indoor pipe temp. sensor malfunction
Outdoor ambient temp. sensor malfunction
Outdoor pipe temp. sensor malfunction
Outdoor air exhaust temp. sensor malfunction
E2 PROM Error
Wire controller ambient temp. sensor malfunction
E1
E2
E3
E4
E5
E6
E3
E3
defrost
E5
F2
E5
E5
E9
E9
F0
F1
F3
F2
F4
E3
F5
YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World !
UNIT MAINTENANCE &
SER
VICE GUIDE
UNIT MAINTENANCE &
SER
VICE GUIDE
P25 OF 36
YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World !
GENERAL PROCEDURES
1) Preparation before maintenance
Step 1: Firstly, confirm the model of the inverter A/C which needs repairing, and then find out model of main
parts that can be damaged easily and the material encode, especially the controller of outdoor unit;
Step 2: Basing on the malfunction phenomenon reflected by user, judge the parts which needs for replacing
initially, and bring those parts with you for maintenance.
Step 3: As for repairing the inverter A/C, you should not only bring the common tools, such as screwdriver,
wrench, etc, but also you should bring universal meter and ammeter with you.
2) During the maintenance, don't touch any terminals before the voltage between P and N of power module is
measured less than 50V to avoid electric shock.
3) Before or after the maintenance, you should check whether the users' power socket, terminal block on indoor/
outdoor unit and all connectors on main board (especially the main board of outdoor unit, power module and
PFC module) are loosened or not.
CHECKING UNITS PRIOR TO CONTACTING YOUR TECHNICIAN