– 10 –
TROUBLESHOOTING GUIDE
CHECK FOLLOWING STEPS
[fig. 3] Voltage of PUMP on the PCB(CONTROLLER)
7
PUMP
FUSE CF3
(250V T5A)
B
W
+
-
0 Ω
PCB
(CONTROLLER)
[fig. 2] Voltage of fan motor on the PCB(CONTROLLER)
[fig. 1] Continuity of current fuse on the PCB (CONTROL-
LER)
9
FAN MOTOR
FUSE CF4
(250V T3.15A)
BL Y W B R
+ + +
+
-
0 Ω
PCB
(CONTROLLER)
[fig. 4] Resistance of 4-way valve coil
Take off the connector and check the resistance 4-way
valve coil.
Measure voltage between the connector pins of con-
nector
9
. Connector
9
shall be checked during heat-
ing or cooling operation.
Measure voltage as follows without taking off the con-
nector
9
.
Measure voltage between the connector pins of con-
nector
7
. Connector
7
shall be checked during heat-
ing or cooling operation.
Measure voltage as follows without taking off the con-
nector
7
.
PCB
(CONTROLLER)
is Normal
PCB
(CONTROLLER)
is Normal
between red
+
and black approx. DC200~370V
between yellow
+
and black approx. DC3~7V
between white
+
and black approx. DC15V
between black
+
and white approx.
AC207~253V
Fan motor
Error
Pump Error
0Ω
FUSE CF3
(250V T5A)
PCB
(CONTROLLER)
FUSE CF1
(250V T25A)
0Ω
4-way valve coil
1360Ω