Troubleshooting By 7-Segment Display - Hitachi Utopia RPI-2.5HRG Service Manual

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