Mitsubishi Electric Mr.Slim PMH-P25BA Service Manual page 17

9-4. WHEN WIRED REMOTE CONTROLLER OR INDOOR UNIT MICRO COMPUTE TROUBLES
1. If there is not any other wrong when trouble occurs, emergency operation starts as the indoor controller board switch (SWE)
is set to ON.
During the emergency operation the indoor unit is as follows;
(1) Indoor fan high speed operation
2. When emergency operating for COOL or HEAT, setting of the switch (SWE) in the indoor controller board and outdoor unit
emergency operation are necessary.
3. Check items and notices as the emergency operation
(1) Emergency operation cannot be used as follows;
• When the outdoor unit is something wrong.
• When the indoor fan is something wrong.
• When drain over flow protected operation is detected during self-diagnosis. (Error code : P5)
(2) Emergency operation will be serial operation by the power supply ON/OFF.
ON/OFF or temperature, etc. adjustment is not operated by the remote controller.
(3) Do not operate for a long time as cold air is blown when the outdoor unit starts defrosting operation during heat emer-
gency operation.
(4) Cool emergency operation must be within 10 hours. Otherwise, heat exchanger of indoor unit may get frosted.
(5) After completing the emergency operation, return the switch setting, etc. in former state.
(6) Since vane does not work at emergency operation, position the vane slowly by hand.
9-5. HOW TO CHECK THE PARTS
PMH-P25BA
PMH-P35BA
PMH-P50BA
Parts name
Room temperature Disconnect the connector then measure the resistance using a tester.
thermistor (TH1)
(Surrounding temperature 10:~30:)
Pipe temperature
thermistor (TH2)
Condenser/evaporator
temperature thermistor
(TH5)
Vane motor Measure the resistance between the terminals using a tester.
(Surrounding temperature 20:~30:)
2
Yellow
MV
4
Red
5
Brown
1 3
Green Orange
Drain-up Measure the resistance between the terminals using a tester.
mechanism (Surrounding temperature 20:)
Blue
1
3
Blue
Drain sensor Measure the resistance between the terminals using a tester.
(Surrounding temperature 20:~30:)
1
2
3
(2) Drain-up machine operation
Normal Abnormal
4.3k"~9.6k" Open or short
Connector Normal
Brown — Yellow
Brown — Red
380" i7%
Brown — Orange
Brown — Green
Normal Abnormal
400"~480" Open or short
Normal Abnormal
0.6k"~6.0k" Open or short
Check points
(Refer to <Thermistor Characteristic graph> in detail.)
Abnormal
Open or short
(Refer to <Thermistor Characteristic graph> in detail.)
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