York YEFE BZTM-MOW1 Series, Service Manual

Page: 103 / 110

Tr
oubleshooting
 Page 99 
5.9 Lack of Phase diagnosis and solution
Description : Outdoor PCB detects the voltage of one or two phase are very low.
Recommended parts to prepare:
• Problems of 3-phase power supply
• Wiring mistake of 3-phase power supply
• Faulty outdoor PCB
Troubleshooting and repair :
Lack of phase
Lack of phase
Y ES
Replace the outdoor m ain PC B
Replace the outdoor m ain PC B
is it 3 phase, 220 - 230V ?
is it 3 phase, 220 - 230V ?
Y ES
Is the voltage in outdoor term inal is 3
phase, 220 - 230V ?
Is the voltage in outdoor term inal is 3
phase, 220 - 230V ?
C heck the pow er supply
C heck the pow er supply
C heck the connection betw een pow er supply
and term inal
C heck the connection betw een pow er supply
and term inal
Restart the unit w hen the pow er
supply returns to norm al
Restart the unit w hen the pow er
supply returns to norm al
N O
Reconnect the pow er w iring
Reconnect the pow er w iring N O
is the pow er w iring
w ired correctly ?
is the pow er w iring
w ired correctly ?
N O
Y ES