63
Installation and Maintenance
Service Manual
9.1 Error Code List
9. Maintenance
No. Malfunction Name
Display Method of
Indoor Unit
A/C status Possible Causes
Dual-8 Code
Display
1
Indoor ambient
temperature sensor is
open/short- circuited
F1
The unit will stop operation as it reaches
the temperature point. During cooling
and drying operation, except indoor
fan operates, other loads
（
such as
compressor, outdoor fan, 4-way valve
）
stop operation; During heating operation,
the complete unit stops operation.
1. The wiring terminal between indoor
ambient temperature sensor and controller
is loosened or poorly contacted;
2. There’s short circuit due to trip-over of
the parts on controller;
3.Indoor ambient temperature sensor is
damaged (Please check it by referring to
the resistance table for temperature sensor)
4. Main board is broken.
2
Indoor evaporator
temperature sensor is
open/short-circuited
F2
The unit will stop operation as it reaches
the temperature point. During cooling
and drying operation, except indoor fan
operates, other loads stop operation;
During heating operation, the complete unit
stops operation.
1. The wiring terminal between indoor
evaporator temperature sensor and
controller is loosened or poorly contacted;
2. There’s short circuit due to the trip-over
of the parts on controller;
3.Indoor evaporator temperature sensor is
damaged (Please check it by referring to
the resistance table for temperature sensor)
4. Main board is broken.
3
Blocked protection of
IDU fan motor
H6
IDU fan, ODU fan, compressor and electric
heat tube stop operation. Horizontal louver
stops at the current position.
1. The feedback terminal of PG motor is
not connected tightly.
2. The control terminal of PG motor is not
connected tightly.
3. Fan blade rotates unsmoothly.
4. Malfunction of motor
5. Main board is broken.
4
Malfunction protection
of jumper cap
C5
Operation of remote controller or control
panel is available, but the unit won’t act.
1. There’s not jumper cap on the main
board.
2. Jumper cap is not inserted properly and
tightly.
3. Jumper cap is damaged.
4. Controller is damaged.
5
Zero-crossing
inspection circuit
malfunction of the IDU
fan motor
U8
Operation of remote controller or control
panel is available, but the unit won’t act.
1. Quick de-energization and energization.
Wrong judgement by the controller
because the electric-discharging of
capacitor is slow.
2. Zero-crossing inspection circuit of main
board for controller is abnormal.
6
Outdoor ambient
temperature sensor is
open/short-circuited
F3
The unit will stop operation as it reaches
the temperature point. During cooling
and drying operation, compressor stops
and indoor fan operates; During heating
operation, the complete unit stops
operation.
1. The wiring terminal between outdoor
ambient temperature sensor and controller
is loosened or poorly contacted;
2. There’s short circuit due to the trip-over
of the parts on controller;
3.Outdoor ambient temperature sensor is
damaged (Please check it by referring to
the resistance table for temperature sensor)
4. Main board is broken.
7
Outdoor condenser
temperature sensor is
open/short-circuited
F4
The unit will stop operation as it reaches
the temperature point. During cooling
and drying operation, compressor stops
and indoor fan operates; During heating
operation, the complete unit stops
operation.
1. The wiring terminal between outdoor
condenser temperature sensor and
controller is loosened or poorly contacted;
2. There’s short circuit due to the trip-over
of the parts on controller;
3.Outdoor condenser temperature sensor
is damaged (Please check it by referring to
the resistance table for temperature sensor)
4. Main board is broken.
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