Johnson Controls YVAHP0721CW Series, Service Manual

Page: 205 / 416

SM-16007
3-41
TROUBLESHOOTING
Alarm
Code
Activation of Protection Device in Outdoor Unit
Model
Correct Voltage
between PCN2#1 and
Faston Terminal S1
High Pressure Switch
PSH1
(PCN2)
PSH2
(PCN16)
(H,Y)VAHP072B31CW
(H,Y)VAHP096B31CW
208/230V ȅ ȅ
(H,Y)VAHP072B41CW
(H,Y)VAHP096B41CW
220V ȅ ȅ
O
7KH581LQGLFDWRUUHGÀDVKHV
O
The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code*
1)
,
the model name*
1)
and the number of connected indoor units are displayed on the LCD. The indoor unit
number and the alarm code are displayed on the 7-segment display of the outdoor unit PCB.
*1) Except for some models.
+
This alarm code is indicated when the high pressure switch (PSH) is activated during the compressor
operation (Y52C is turned ON).
O.U. PCB: Outdoor Unit PCB
*2): CMC Voltage and Number of Pressure Switch
Is CMC1 ON
when starting?
Does CMC1 turn
ON for more than
three seconds?
Yes No
Normal O.U. PCB
Is the voltage between PCN2 #1
and faston terminal "S1" on
O.U. PCB correct* 2
during LED ON?
Yes
Is the protective device
still operating?
No continuity between #1
and #3 of PCN2, PCN16
on O.U. PCB.
Is PCN2 or PCN16
on O.U. PCB
loose?
Yes
Yes
Yes
Check activation of the following safety devices. Remove the cause after checking.
High Pressure Switch (PSH): 602psi (4.15MPa)
Faulty O.U. PCB
Faulty O.U. PCB
Restart after connecting
PCN2 or PCN16 on
O.U. PCB correctly.
Check wiring connection
except for O.U. PCB.
No (No Voltage)
No (No Looseness)
No
No
correct
*2)