Carrier MMY-MAP1204FT9UL - Page 180

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No
No No
No
No
No
[P19]
Sub-code: Detected outdoor unit No.
Check code CauseCheck code name
4-way valve reverse error
1. 4-way valve error 2. TS1 sensor/TE1 sensor error 3. Pd sensor/Ps sensor error 4. TE sensor/TL sensor misconnection 5. SV14 valve circuit operation error (Coil wiring falls out)
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 sensors
normal?
Are TS1, TE1
and TL 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)
Sensor error
Sensor error Correct connector connection TS1 sensor: CN505 TE1 sensor: CN520 TL sensor: CN523
If no error occurs in the test operation, restart operation.
4-way valve error Check 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=[9], SW03=[2] → TE sensor temperature
<Judgment criteria> TE1 sensor: Normal if TE1 is 86°F (30°C) or less in the seasons except summer (Outside temp 68°F (20°C) or lower) TS1 sensor: Normal if TS is 122°F (50°C) or less in the seasons except summer (Outside temp 68°F (20°C) or lower)
* See "Outdoor unit temperature sensor characteristics" on "9-9. Sensor Characteristics".
No
Is
Cooling/Heating
FS unit normal?
Repair Cooling/Heating FS unit.
Ye s Ye s
[P20]
Check code CauseCheck code name
High-pressure protective operation
1. Pd sensor error 2. Service valve closed. 3. Indoor/outdoor fan error 4. Indoor/outdoor PMV clogging 5. Indoor/outdoor heat exchanger clogging 6. SV2 circuit error 7. SV4 circuit error 8. SV5 circuit error 9. Outdoor I/F P.C. board error 10. Operation error of check valve of main discharge pipe 11. Refrigerant overcharge
Are service valves fully
opened?
Is
Cooling/Heating
FS unit
normal?
Open service valves fully. Repair Cooling/Heating FS unit.
Reset power supply, and start a test operation corresponded to the season.
All Cooling → To (B) All heating → To (C)
* 1. Pressure by pressure gauge (Check joint) 2. Pressure display on 7-segment display 3. Output voltage of I/F P.C. board If 1 and 2, 3 are different, an error of pressure sensor is considered. If 2 and 3 are different, check I/F P.C. board.
No No
Are
characteristics of
highpressure sensor
normal?
Check parts. Failure → Replace
NORMAL NORMAL NORMAL
Check
incorrect piping of discharge
gas/suction gas main
pipes.
Correct piping as normal.
ABNORMAL ABNORMAL ABNORMAL
PMV4, SV12
operation check
Replace defective parts.