Mitsubishi Electric Mr.Slim PUH-P25VGAA Service Manual page 64

Split-type, heat pump air conditioners, r407c, outdoor unit
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From the preceding page.
Indication (O.B)
LED1
LED2
(Green)
(Red)
•Abnormal high discharge temperature(TH4)
3 blinks
1 blink
2 blinks
•Abnormal high pressure (High pressure
switch 63H worked)
•Abnormal low pressure (Low pressure
switch 63L worked)
3 blinks
•Protection from overheat operation (TH3)
4 blinks
•Compressor's overcurrent (Overload)
•Thermal relay (51C) has been tripped
•Overcurrent has locked the operation of
compressor in start-up.
5 blinks
•Open / short circuit of discharge thermistor (TH4)
•Open / short circuit of liquid pipe thermistor (TH3)
•Open / short circuit of EVA / COND pipe
thermistor (TH6)
4 blinks
1 blinks
•Abnormality of room temperature thermistor
(Indoor unit side: TH1)
•Abnormality of Liquid pipe thermistor
(Indoor unit side:TH2)
•Abnormality of EVA / COND pipe thermistor
(Indoor unit side: TH5)
2 blinks
•Abnormality of drain sensor
(Indoor unit side : (DS))
•Malfunction of drain-up machine
3 blinks
•Abnormality of pipe temperature
Error Name
Inspection method
1 Check if ball valves are open.
2 Check the continuity of connector (TH4) on outdoor controller
board by using a tester.
3 Check if the unit fills the refrigerant at the same amount as
specified.
1 Check if indoor / outdoor units have a short cycle on their air
ducts.
2 Check if the connector of 52C (63H) on outdoor controller
board is disconnected.
3 Check if the units get their heat exchanger and filter dirty and
clogged.
4 Measure resistance values among terminals on linear
expansion valve by using a tester.
1 Check stop valve.
234 Put the power off and on again to check if F3 is displayed
on restarting. If F3 is displayed, follow the F3 processing
direction.
5 Correct to proper amount of refrigerant.
6 Check linear expansion valve. Refer to 10-6.
1 Check if outdoor unit has a short cycle on its air duct.
2 Check if the connector of TH3 on outdoor controller board is
disconnected.
1 Check if ball valves are open.
2 Measure resistance values among terminals on compressor
by using a tester.
3 Check if outdoor unit has a short cycle on its air duct.
4 Check if the connector of 51CM (51C) on outdoor controller
board is disconnected.
5 Check if the units get their heat exchanger and filter dirty and
clogged.
1 Check if the connectors of TH4, TH3, and TH6 on outdoor
controller board are disconnected.
2 Measure the resistance values of each thermistor
(TH4, TH3, and TH6).
1 Check if the connectors of CN20, CN21, and CN29 on
outdoor controller board are disconnected.
2 Measure the resistance values of each thermistor
(TH1, TH2, and TH5).
1 Check if the connector of CN31 on outdoor controller board
is disconnected.
2 Measure the resistance value of drain sensor.
3 Measure resistance values among terminals on drain-up
machine by using a tester.
1 Check if the connectors of CN20, CN21, and CN29 on
outdoor controller board are disconnected.
2 Check if ball valves are open.
3 Check if the wirings are correct on the connecting wires of
indoor / outdoor units.
64

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