Johnson Controls YVAHP0721CW Series, Service Manual

Page: 213 / 416

SM-16007
3-49
TROUBLESHOOTING
Alarm
Code
Abnormality of Power Source Phase
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 displayed when the main power source phase is reversely connected or one phase
is not connected.
Correctly connect each phase
of power source.
No
Open Phase
(Is there any phase not connected?)
No
Yes
O.U. PCB is normal.
O.U. PCB is normal.
O.U. PCB is normal.
Voltage for unit to
be suspended.
Running Voltage:
"B" V
Starting Voltage:
Less than "A" V
Abnormality with Power Source.
Is there any excessive voltage
decrease at power source?
Yes
Correctly connect each phase
of power source.
Faulty O.U. PCB.
No
Reverse Phase Connection?
Yes
Cause Check Item
Action
(Turn OFF Main Switch)
Event
Activation of
Reverse Phase
Sensor in
Outdoor Unit
Check it according
to electrical wiring
in Section 3.1.1.
Replace wires, repair
and tighten screws
or correct wiring.
Reverse or Open Phase
Replace O.U. PCB
if faulty.
Faulty O.U. PCB
Check Item
Power Supply “A” “B”
208-230V/60Hz 177 188 to 253
460V/60Hz 391 414 to 506
O.U. PCB: Outdoor Unit PCB