Pressure Sensor Abnormality (Bc Controller); Pressure Sensor Abnormality (Outdoor Unit); Iac Sensor/Circuit Abnormality - Mitsubishi Electric PUHY-200YMF-C Service Handbook

Checking code Meaning, detecting method
1 When pressue sensor detects
5201 Pressure
sensor 1kg/cm
abnormality ing operation, outdoor unit once
(outdoor unit) stops with 3 minutes restarting
mode, and restarts if the detected
pressure of pressure sensor ex-
ceeds 1kg/cm
imediately before restarting.
2 If the detected pressure of sen-
sor is less than 1kg/cm
(0.098MPa) immediately before
restarting, error stop is com-
menced displaying 5201.
3 Under 3 minutes restarting
mode, LED displays intermittent
fault check.
4 During 3 minutes after com-
pressor start, defrosting and 3
minutes after defrosting opera-
tions, trouble detection is ig-
nored.
5201 High When high or intermidiate pressure
pressure sensor
side (0.098MPa) or less immediately be-
fore starting, error stop is com-
5203 Intermedi- menced displaying "5201", or
ate "5203".
5301 IAC sensor/ 1 If IAC
circuit before the inverter starts, or
abnormality If IAC
ing inverter operation after 5
seconds has passed since the
inverter started when the INV
board's SW1-1 is OFF.
[Inverter error detail : 6]
2 If the current sensor (ACCT)
miss-wiring is detected during
inverter operation.
[Inverter error detail : 13]
Compressor-input
phase U
1) Pressutre sensor trouble.
2
G (0.098MPa) or less dur-
2) Inner pressure drop due to a leak-
3) Broken cover.
2 G (0.098MPa) 4) Coming off of pin at connector por-
5) Broken wire.
6) Faulty thermistor input circuit of
2 G
1) Pressure sensor trouble.
2
detects 1kg/cm G
2) Inner pressure drop due to gas leak.
3) Broken cover.
4) Coming off of pin at connector por-
5) Broken wire.
6) Faulty pressure sensor input circuit
3 Arms is detected just 1) Contact is faulty.
3 Arms is detected dur-
2) The current sensor (ACCT) is con-
3) The wiring is defective
4) The Ac current sensor (ACCT) is
5) The IPM is defective.
ACCT_U
IPM-output
phase U
Red wire
Cause
age.
tion, poor contact.
MAIN board.
tion, poor contact.
of control board.
nected with wrong polarity.
defective.
Compressor-input
phase W
–131–
Checking method & Countermeasure
See Troubleshooting of pressure
sensor.
See troubleshooting of pressure
sensor.
Check the contacts of CNACCT on the
INV board.
Check the ACCT_U, W polarity
with below drawing.
Check 1. connections.
2. contact at the connectors.
3. for broken wires in the follow-
ing wiring.
CNDR2-CNDR1
CN15V2-CN15V1
IPM-MC1
To judgefailure of ACCT, go to "individual
Parts Failure Judgment Methods."
Check the IPM.
Judge that the IPM is fauly, (Go to "In-
dividual Parts Failure Judgment Meth-
ods.")
ACCT_W
IPM-output
phase W
Black wire