Ye
s
Ye
s
No
No
No
No
Ye
s
Ye
s
No
No
Ye
s
[P17]
Cause
Check code
Check code name
Discharge temp
TD2 trouble
1.
Outdoor unit service valve closed
2. Outdoor
PMV
trouble
3.
TD2 sensor trouble
4.
Refrigerant shortage, clogging of refrigerant circuit
5.
4-way valve trouble
6.
SV4 circuit leakage, misinstallation
Are service valves
of gas and liquid
sides fully opened?
Open service valves fully
.
Repair outdoor PMV
.
Replace TD2
sensor
.
Check 4-way valve.
Correct installation of
valve coil.
Replace SV42 valve.
Correct wiring
Refrigerant shortage,
clogging, pipe breakage
Are indoor units of a
dif
ferent refrigerant line
connected?
Are
characteristics
of TD2
sensor
resistance
normal?
Does discharge
refrigerant gas bypass
to suction side through
4-way valve?
Connectors: PMV1: CN300, PMV2: CN301,
PMV3: CN302, PMV4: CN303
Ye
s
(Check it using the miswiring check
function of the outdoor unit.)
(Check there is no pipe breakage, and
then recharge the refrigerant.)
Is outdoor PMV normal?
1. Connector connection
2. Wiring
.
3
li
o
C
4. V
alve body
5. Outdoor I/F P
.C. board
SV4 circuit
1.
Are SV41, SV42
valve coils installed correctly?
Is SV42 circuit sealed
2.
correctly (no leakage)?
Ye
s
*
S
ee “O
utd
oo
r unit tempe
ratu
re
sen
sor
characteristics” on
“8-
10. Sensor Characteristics”.
No
Charge refrigerant after
fixing the part of refrigerant
leakage
Is there
refrigerant leakage?
Ye
s
No
Ye
s
No
Ye
s
No
No
No
Ye
s
No
Ye
s
[P19]
Sub-code: Detected outdoor unit No.
Cause
Check code
Check code name
4-way valve reverse trouble
1.
4-way valve trouble
2. TS1
sensor/TE1
sensor
trouble
3. Pd
sensor/Ps
sensor
trouble
4.
TE1 sensor/TL1 sensor misconnection
Is 4-way valve
coil connector
connected?
Are output voltage
characteristics of Pd and
Ps sensors normal?
Are
characteristics of
resistance value of
TS1,
TE1 and
TL
1
sensors
normal?
Are TS1, TE1
and TL1
sensor
connectors connected
normally?
Does
discharge refrigerant
gas bypass to suction
side through 4-way
valve? *1
Does 4-way valve
operate?
Correct connector connection.
(4-way valve coil: CN317)
Replace sensor
Replace sensor
Correct connector connection
TS1 sensor: CN378
TE1 sensor: CN381
TL
1
sensor: CN378
If no trouble occurs in the test
operation, restart operation.
Replace 4-way valve.
Replace 4-way valve.
Reset the power supply and
start heating test operation.
*1 Check
TS1 and
TE1 temperature of the outdoor unit which is running.
(I/F) SW01=[1], SW02=[7], SW03=[2]
TS sensor temperature
SW01=[1], SW02=[10], SW03=[2]
TE
sensor
temperature
<Judgment criteria>
TE1 sensor: Normal if
TE1 is 30°C or less in the seasons except
summer (Outside temp 20°C or lower)
TS1 sensor: Normal if
TS is 50°C or less in the seasons except
summer (Outside temp 20°C or lower)
* Se
e “Ou
tdo
or un
it te
mp
erat
ure se
nso
r
characteristics”
on
“8-
10. Sensor Characteristics”.
- 222 -
Summary of Contents for MMY-MUP0801HT7JP
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