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AY-ZP35PR
No
I
e t
m
2
Inverter DC power supply
voltage check
3
IPM circuit check
4
Compressor check
5
Expansion valve check
6
Final check
2. Troubleshooting of outdoor unit electric components
Check 220-240VAC
input voltage.
NO
Does LED light?
YES
NO
Does LED flash?
YES
Normal
C
h
e
c
k
m
e
h t
o
d
Measure DC voltage between IPM
pins (31) and (35).
Check that 3 lamps (load) light.
Check position detection voltage (+15
V, 5 V) on control PWB.
Measure compressor coil resistance
(for each phase of U, V and W).
Use multi-meter or digital tester capa-
ble of displaying two digits right of the
decimal point (0.01 ).
Measure expansion valve coil resis-
tance.
Turn off power, and connect compres-
sor cords to compressor.
Operate air conditioner.
Measure DC voltage between IPM
pins (20) and (24).
Check 320VDC
between IPM pins
(20) and (24) ?
Check switching
power supply
output of 12 VDC,
15 VDC ?
Check 5 VDC
output ?
N
r o
m
l a
v
a
u l
e
c /
o
n
d
t i
o i
3
2
0
V
D
C
Each voltage should be normal.
All 3 lamps (load) should light with
same intensity.
Resistance value at 20 C --- 0.65
Each phase 46
3
(at 20
Compressor should operate nor-
mally.
280 VDC or higher.
NO
Short-circuit in DC fan motor
Short-circuit in IPM
Short-circuit in diode bridge
Blown fuse
Defective electrolytic capacitor
Wire disconnection, PWB pattern damage
YES
Short-circuit in PAM IGBT (Q5)
NO
Defective switching power supply circuit
Malfunction of 3-terminal regulator IC4, IC1
Short-circuit in expansion valve coil
Malfunction of transistor array IC7
Solder contact or other problems
YES
NO
Malfunction of 3-terminal regulator IC3, IC2.
YES
Microcomputer oscillator error
Malfunction of microcomputer reset IC
Malfunction of microcomputer
Malfunction of serial signal circuit
Check wiring between indoor and outdoor units.
3-12
n
R
e
m
e
d
y
R
e
p
a l
c
e
c
o
n
r t
l o
P
W
. B
Replace diode bridge.
Correct soldered section of Fas-
ten tabs (T1, T2, T5 - T3) on con-
trol PWB and IMP (S, C, R).
(Repair solder cracks.)
Replace control PWB.
Correct connections at compres-
sor terminals.
Replace compressor.
C)
Replace expansion valve.
Replace control PWB.
Replace outdoor unit thermistor.
Replace compressor (in case of
compressor lock).
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Table of Contents
Troubleshooting
