Mitsubishi Electric EHPT20Q-VM2EA Service Manual page 48

Part Name
Flow sensor (1,A,B)
Yellow
White
Flow signal V
Green
5V DC
Brown
part name
Flow sensor 1
Flow sensor A
Flow sensor B
Booster heater
Thermostat (90 °C) and thermal cut out (121 °C)
121 °C
Thermal
cut-out
9
2kW heater (230V, 1 phase)
Earth leakage circuit breaker for heater
GCH15010
1
4
CN1A
symbol
CN1A
CN2A
CN2B
90 °C
Manual reset
water
thermostat
10
2kW
1 2
Check Points
Flow sensor 1 , B
Flow signal
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.35V
0.0
0 4
Flow [l/min]
Flow sensor A
Flow signal
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.35V
0.0
0 8
Flow [l/min]
Measure the resistance between the terminals with a tester.
Terminal
9-10 80
Terminal
1-2
If a short circuit occurs on the booster heater, or each power line,
a short-circuit breaker will trip and power source will be blocked.
Eliminate the causes of short circuit and then turn on the breaker again.
48
8 12 16 20
16 24 32 40
Normal Abnormal
Open or Short
Normal Abnormal
Open or Short