Mitsubishi Electric EHGT17D-YM9ED Service Manual page 58

Part Name
3-way valve
<DHW>
Motor
Indicator (red)
B
A
Release button
Valve
B A
AB
Thermistors
Thermistor (TH3)
<Liquid>
Thermistor (TH4)
<Discharge>
Thermistor (TH7)
<Ambient>
Thermistor (TH8)
<Heat sink>
Thermistor (TH32)
<Brine inlet>
Thermistor (TH33)
<Comp. surface>
Thermistor (TH34)
<Brine outlet>
Brine pump (MBP1)
Motor for compressor
(MC)
U
V
W
Linear expansion valve
(LEV-A)
RD
M 1
BU
2
OG
3
YE
4
WH
5
OCH722A
(1) Check the movement of the red indicator. The red indicator normally points to A in DHW mode and to
B in Heating mode as shown to the left.
<Heating>
(2) If each indicator position is correct but the 3-way valve does not work properly, the motor may not fit
onto the valve securely, so remove the motor by pressing the release button, and reinstall it.
B
A
B A
AB
Disconnect the connector then measure the resistance with a tester.
(At ambient temperatures of 10–30°C.)
Thermistor
TH1
TH2
TH3
TH4
TH7
TH8
TH32
TH33
TH34
THW1
THW2
THW5
THW6
THW7
THW8
THW9
THWB1
Refer to the next page.
Measure the resistance between the terminals with a tester. (Winding temperature 20°C)
EHGT17D-YM9ED
1.65
Disconnect the connector then measure the resistance with a tester. (Winding temperature 20°C)
Red - White
Checkpoints
Normal Abnormal
4.3 – 9.5 kΩ
4.3 – 9.6 kΩ
160 – 410 kΩ
4.3 – 9.6 kΩ
39 – 105 kΩ
4.3 – 9.6 kΩ
Open or short
4.3 – 9.5 kΩ
40 – 100 kΩ
Abnormal
Open or short
Normal
Red - Orange Red - Yellow
46 ± 4 Ω
58
Abnormal
Red - Blue
Open or short