Mitsubishi Heavy Industries FDT100VNAWVH Service Manual page 145

Error code
Remote control: WAIT
1. Applicable model
All models
2. Error detection method
3. Condition of error displayed
4. Presumable cause
• Faulty noise filter
• Faulty indoor unit control PCB
• Faulty outdoor unit main PCB
• Faulty fan motor
Note:
RUN light TIMER light
Indoor
display
– –
Green LED Red LED
Outdoor unit
control PCB
Keeps flashing 2-time flash
5. Troubleshooting
Diagnosis
Diagnosis for when the outdoor unit
main PCB LED is turned off
Shut down the breaker and back on
again the breaker 3 minutes later.
From previous
page
NO
Does it reset normally?
Isn't the outdoor
unit control power source fuse
(30A) blown?
To check method for inverter PCB before
replacment of blown power source fuse.
YES
Is AC220/240V or AC380/415V
detected at the noise filter
secondary side?
YES
Is DC255-310V detected at CNA2?
YES
Isn't fuse
〔250V, 2A〕 on the outdoor unit main
PCB blown?
YES
Is DC5V
detected on the outdoor unit main PCB (Between
Œ- of CNV)?
YES
Is DC5V detected
if the connector of outdoor fan motor
is disconnected?
YES
Is DC5V detected
if the inverter power source connector (CNI2)
is disconnected?
144
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Content
Communication error at
initial operation (2/3)
YES
Note (1) 1-phase model only
(1)
NO
To next page
NO
NO
NO
NO
NO
NO
YES
-
'19 • PAC-SM-309
Countermeasure
Normal (Malfunction by
noise)
Replace noise filter.
Check connection of diode
stack and electrolytic
capacitor by refering main
electrical circuit diagram
Defective outdoor unit
main PCB ➞ Replace.
Defective outdoor unit
main PCB ➞ Replace.
Defective outdoor fan
motor
Defective outdoor unit
main PCB ➞ Replace.
Defective outdoor unit
main PCB ➞ Replace.