Mitsubishi Electric CITY MULTI PUHY-P108 Service Handbook page 341

[ IX Troubleshooting ]
Note1 For the connectors on the board, TH11 and TH12 are connected to CN10, and TH15 and TH16 are connected to
CN11. Disconnect the connector in trouble, and check the sensor of each number.
Note 2, 3
1) Pull out the sensor connector from the I/O board
Do not pull the sensor by holding the lead wire.
2) Measure the resistance with such as a tester.
3) Compare the measured value with that of shown in the figure below. When the result is +-10%, it is normal.
Note4 Check the self-diagnosis switch (Outdoor control board SW1).
Measurement data
Liquid inlet temperature
NU-G GA
Bypass outlet temperature
(Standard / main)
Bypass inlet temperature
Bypass inlet temperature
Bypass outlet temperature
NU-GB
(Sub 1)
Bypass inlet temperature
Bypass outlet temperature
NU-GB
(Sub 2)
Bypass inlet temperature
Symbol SW1 setting value
1 2 3 4 5 6 7 8 9 10
ON
TH11
1 2 3 4 5 6 7 8 9 10
ON
TH12
1 2 3 4 5 6 7 8 9 10
ON
TH15
1 2 3 4 5 6 7 8 9 10
ON
TH16
1 2 3 4 5 6 7 8 9 10
ON
TH22
1 2 3 4 5 6 7 8 9 10
ON
TH25
1 2 3 4 5 6 7 8 9 10
ON
TH22
1 2 3 4 5 6 7 8 9 10
ON
TH25
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