Mitsubishi Electric CITY MULTI PQRY-P200YMF-C Service Handbook page 117

Checking code Meaning, detecting method
5201 Pressure 1. When pressue sensor detects 1kg/
sensor cm
abnormality operation, heat source unit once
(heat source stops with 3 minutes restarting
unit) 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.
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
2 G (0.098MPa) or less during
2 G (0.098MPa)
2 G
3 Arms is detected just
3 Arms is detected dur-
ACCT_U
Cause
1) Pressutre sensor trouble.
2) Inner pressure drop due to a leak-
age.
3) Broken cover.
4) Coming off of pin at connector por-
tion, poor contact.
5) Broken wire.
6) Faulty thermistor input circuit of
MAIN board.
1) Contact is faulty.
2) The current sensor (ACCT) is con-
nected with wrong polarity.
3) The wiring is defective
4) The Ac current sensor (ACCT) is
defective.
5) The IPM is defective.
IPM-output Compressor-input
phase U phase W
Red wire
–116–
Checking method & Countermeasure
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