Service Manual
Installation and Maintenance
38
Series
code
Malfunction
name
Display method of indoor unit (dial-8 code)
AC status
Possible causes
Code
Indicator display
Operation
indicator
Cooling
code
Heating
code
Status
indicator
(PTAC)
15
Low
temperature
prevention
protection
FP
Start up electric heating
operation;
1. The ambient temperature
is low or the resistance value
of temperature sensor is
abnormal;
16
Wrong wire
connection
reminding
for the wired
controller
Flash 9
times and
off 3s
circularly
The unit operates
according to the signal of
wired controller.
1. Wrong wire connection for
the wired controller;
17
High
temperature
prevention
protection
for the
evaporator
Flash 8
times and
off 3s
circularly
Indoor fan operates;
compressor and outdoor
fan operates or stop
operation according to
the tube temperature of
evaporator.
The electric heating is
started up;
1. Normal phenomenon for
heating;
18
High
temperature
prevention
protection
for outdoor
condenser
Flash 6
times and
off 3s
circularly
Indoor fan operates;
compressor stops
operation, while outdoor
fan operates or stop
operation according to
the tube temperature of
condenser.
1. Normal phenomenon for
cooling;
19
Freeze
prevention
protection
for the
evaporator
Flash 5
times and
off 3s
circularly
Indoor fan operates;
compressor and outdoor
fan stop operation;
1. Normal phenomenon for
cooling;
20
Frost
prevention
(heat pump)
Flash 7
times and
off 3s
circularly
Indoor fan operates;
compressor and outdoor
fan stop operation.
The electric heating is
started up;
1. Normal phenomenon for
heating;