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TROUBLESHOOTING
1.2.4 Troubleshooting by 7-Segment Display
(1) Checking Method by 7-Segment Display
By using the 7-segments and check switch (PSW) on the PCB1 in the outdoor unit, operation
conditions and each part of refrigeration cycle, can be checked.
Indoor Unit
Capacity Setting
Checking Item
PSW7-Segment
PSW3
SEG1
PSW2
Y52C
1
PSW3 PSW2
To start checking, press the "PSW2" switch
for more than 3 seconds.
To proceed checking, press the "PSW2" switch.
To proceed reversely, press the "PSW3" switch.
To cancel this checking, press the "PSW2"
switch for more than 3 seconds.
Backward Forward
PSW2 PSW3
Output State of
Outdoor Micro-Computer
PSW3 PSW2
2
PSW2 PSW3
The Latest Alarm Code
Cause of Stoppage at
Outdoor Unit
Checking Contents
25 to 115 (Hz) *1)
*1)
PSW3 PSW2
3
PSW2 PSW3
Running Frequency of
Inverter Compressor
PSW3 PSW2
4
PSW2 PSW3
Request Frequency from
Indoor Unit
PSW3 PSW2
5
PSW2 PSW3
Outdoor Air Flow Ratio
PSW3 PSW2
6
PSW2 PSW3
Outdoor Unit Expansion
Valve Opening
PSW3 PSW2
7
PSW2 PSW3
Y21
FAN2
YCH
63H2
FAN1
Check
PSW3PSW2
(In case that frequency is higher
than 100Hz, two digits flicker.)
25 to 115 (Hz)
(In case that frequency is higher
than 100Hz, two digits flicker.)
00 to 100 (%)
(In case that air flow ratio is higher
than 100%, two digits flicker.)
(In case that air flow ratio is higher
than 100%, two digits flicker.)
00 to 100 (%)
00 to 40
Indicates the last alarm
code in the cause of
compressor stoppage.
Discharge Gas
Temperature on the Top
of Compressor
PSW3 PSW2
8
PSW2 PSW3
Evaporator
Temperature at Heating
PSW3 PSW2
9
PSW2 PSW3
00 to 142 (°C)
-19 to 80 (°C)
00: Open-Circuited
27: Short-Circuited
(Flicker)
-19: Open-Circuited
27: Short-Circuited
(Flicker)
(In case that temperature is higher
than 100°C, two digits flicker.)
*1): The pole of comp. is four, it is indicated
the half value of actual frequency.
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