Johnson Controls YVAHP0721CW Series, Service Manual

Page: 214 / 416

3-50
SM-16007
TROUBLESHOOTING
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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.
+
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times in 30 minutes, the operation stops and this alarm code is displayed. If this occurs less than three
times in 30 minutes, the operation automatically restarts.
*1): If the capacitor has high voltage, perform the high voltage discharge work according to Section 4.2.1.1.
*2): Refer to Section 4.2.1.1 for checking procedures for the transistor module.
*3): Refer to Section 4.2.1.1 for checking procedures for the capacitor.
Does the voltage
fall during operation
by operation of
other apparatus?
Is connection correct
between inverter PCB,
capacitors A*,
DCL and CMC?
Does LED201 on
inverter PCB
ON after compressor's
electromagnetic switches
(CMC) turn ON?
Check capacitors A*.
Restart operation.
Check wiring and
wire sizes.
Connect it correctly.
Replace capacitors.
Capacitors have high voltage.
Be careful. *1)
Yes
Yes
Yes
Check the wiring, the transistor
module and capacitors A*. *2)
If the wiring is correct,
replace the transistor module.
Yes
Yes
Normal
Normal
Fault
Abnormal
(Loose Wiring,
Change of
Color)
Frequency can
increase higher
than 60Hz.
Compressor stops
immediately.
(lower than 30Hz)
Compressor stops
when frequency
increase. (Approx.
31Hz to 60Hz)
How is
compressor
operation?
Is the DC voltage
over B* V?
* Be especially careful of high voltage.
Yes
No
No
No
No
No
No
Check CMC for Compressor.
Faulty transistor module.
Replace it.
Faulty CMC.
Replace it.
Faulty Inverter PCB
Replace it. *1)
In case of 208/230V 60Hz:
Is the power supply voltage 208V+10% or
230V+10% ?
In case of 460V 60Hz:
Is the power supply voltage 460V+10%?
In case of 208/230V 60Hz:
Is the power supply voltage more than 177V?
In case of 460V 60Hz:
Is the power supply voltage more than 391V?
Check Item
460 208/230V 60Hz
Power Supply
230
CB1, CB2
CB 460V 60Hz
B*
Voltage (DC) A*
Capacitor
Check Item
Power Supply
A*
Capacitor
B*
Voltage (DC)
208-230V/60Hz CB 250
460V/60Hz CB1, CB2 560
Check
capacitors A*. *3)
<Outdoor Unit PCB Display Indication>
Abnormal Inverter
Voltage
Alarm
Code
Abnormal Inverter Voltage
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