49
Installation and Maintenance
Service Manual
12
Malfunction
of outdoor
condenser
temperature
sensor
F4
□
□
☆
□
During cooling and
drying operation,
compressor and
outdoor fan stop
while indoor fan
operates. During
heating operation, all
loads stop.
1.T-SENSOR
terminal hasn’t
been inserted
tightly;
2. Hardware
malfunction of
outdoor unit's
main board;
1. After de-
energization,
reinsert T-SENSOR
terminal tightly;
2. Replace outdoor
unit's main board
AP1;
13
Malfunction
of outdoor
discharge
temperature
sensor
F5
□
□
☆
☆
During cooling and
drying operation,
compressor and
outdoor fan stop
while indoor fan
operates. During
heating operation, all
loads stop.
14
Limit/
decrease
frequency
due to
overload
F6
■
□
☆
☆
All loads operates
normally, while
operation frequency
of compressor
decreases.
See 9.3(diagnosis
of overheating
prevention
and overload
protection)
Refer to
maintenance
flowchart
15
Decrease
frequency
due to
overcurrent
F8
■
■
□
■
All loads operates
normally, while
operation frequency
of compressor
decreases.
Input power
voltage is too low;
1. Check whether
power supply
network is
abnormal;
Pressure of
system is too high;
overload
2. Reduce load;
