Mitsubishi Electric PUHY-200YMF-B Service Handbook page 141

Checking code Meaning, detecting method
4230 Radiator panel If the cooling fan stays ON for 5
overheat minutes or longer during inverter
protection operation, and if THHS
is detected.
4240 Overcurrent If IDC
protection continuously for 10 minutes during
operation of the inverter after 5 or
more seconds have passed since
the inverter started.
1) The wiring is defective.
100°C
2) The INV boar's fuse (F01) is de-
3) The cooling fan (MF1) is defective.
4) The THHS sensor is defective.
5) The air passage is clogged.
6) The INV board is defective.
66.5 A peak is detected 1) Air passage short cycle.
2) The heat exchanger is clogged.
3) Power supply voltage.
4) External air temperature.
5) Capacity setting error.
6) The THHS sensor is defective.
7) The solenoid valves (SV1, 2) are
8) The wiring is defective.
9) Fan motor (MF) operation is defec-
10)The inverter/compressor is defec-
11)The circuit board is defective.
Cause
fective.
defective, or the solenoid valve
drive circuit is defective.
tive.
tive.
–139–
Checking method & Countermeasure
Check 1 connections, 2 contact at the
connectors and 3 for broken wires in
the following wiring.
MF1~CNFAN
If the fuse is defective, replace the fuse.
To judge failure of the MF1, go to "In-
dividual Parts Failure Judgment Meth-
ods."
To judge failure of the THHS, go to
error code "5110".
If the air passage of the heat sink is
clogged, clear the air passage.
If none of the items in 1) to 5) is appli-
cable, and if the trouble reappears
even after the power is switched on
again, replace the INV board (when
replacing the circuit board, be sure to
connect all the connectors, ground
wires, etc. securely).
Is the unit's exhaust short cycling?
Clean the heat exchanger.
If the power supply voltage is less than
342 V, it is outside specifications.
If the external air temperature is over
43°C it is outside the specifications.
• Is the indoor unit capacity total cor-
rect?
• Are the outdoor/indoor unit capac-
ity settings correct?
To judge failure of the THHS, go to the
item for error code "5110."
To judge failure of the solenoid valve,
go to "Individual Parts Failure Judg-
ment Methods" for the "Solenoid Valve."
Check 1 connections, 2 contact at the
connectors and 3 for broken wires in
the following wiring.
TB1A~[F1, F2]~SCRM~CN04~
CNMF~MF
TB1A~CNTR1
CNU~SCRM
CNV~SCRM
CNW~SCRM
CNFC1~CNFC2
Go to "Treating Fan Motor Related
Trouble."
Go to "Treating Inverter/Compressor
Related Trouble."
If none of the items in 1) to 10) is ap-
plicable, and if the trouble reappears
even after the power is switched on
again, replace the INV board (when
replacing the circuit board, be sure to
connect all the connectors, ground
wires, etc. securely).