Mitsubishi Electric CITY MULTI PUHY-400YMF-B, Service Handbook

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Checking code Meaning, detecting method Cause Checking method & Countermeasure
4116
4200
Fan speed
abnormality
(motor
abnormality)
(Indoor unit)
VDC sensor/
circuit
abnormality
(Variable
capacity unit)
Detects only for PKFY-VAM)
1. Detecting fan speed below
180rpm or over 2000rpm dur-
ing fan operation at indoor unit
(first detection) enters into the
3-minute restart prevention
mode to stop fan for 30 sec-
onds.
2. When detecting fan speed be-
low 180rpm or over 2000rpm
again at fan returning after 30
seconds from fan stopping, er-
ror stop (fan also stops) will be
commenced displaying 4116.
1 If VDC 304 V is detected just
before the inverter starts.
2
If VDC 750 V is detected just
before starting of and during
operation of the inverter.
• Confirm slipping off of connector
(CN33) on indoor controller board.
• Confirm slipping off of connector
(FAN1) on indoor power board.
• Check wiring for disconnection.
• Check filter.
• Check indoor fan motor.
• When aboves have no trouble.
1) For trouble after operating fan.
Replace indoor controller board. If
not remedied, replace indoor
power board.
2) For trouble without operating fan.
Replace indoor power board.
• Check if an instantaneous power
failure or power failure, etc. has
occurred.
• Check if the voltage is the rated
voltage value.
Check 1, the connections, 2, contact
at the connectors, 3 tightening torque
at screw tightened portions, 4, wiring
polarities, 5, for broken wires, and 6,
for grounding in the following wiring.
TB1A ~ DS ~ [52C, R1, R5] ~ [C2,
C3] ~ TRM Wiring
TRM ~ CNVDC Wiring
* Check if the wiring polarities are as
shown on the electric wiring dia-
gram plate.
To judge failure of R1 and R5, go to
“Individual Parts Failure Judgment
Methods.”
To judge failure of the 52C, go to “Indi-
vidual Parts Failure Judgment Meth-
ods.”
To judge failure of the DS, go to “Indi-
vidual Parts Failure Judgment Meth-
ods.”
To judge failure of the DCL, go to “In-
dividual Parts Failure Judgment Meth-
ods.”
If none of the items in 1) to 6) 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).
1) Slipping off of fan speed detecting
connector (CN33) of indoor control-
ler board.
2) Slipping off of fan output connector
(FAN1) of indoor power board.
3) Disconnection of fan speed detect-
ing connector (CN33) of indoor con-
troller board, or that of fan output con-
nector (FAN1) of indoor power board.
4) Filter clogging.
5) Trouble of indoor fan motor.
6) Faulty fan speed detecting circuit of
indoor controller board, or faulty fan
output circuit of indoor power board.
1) Power supply voltage is abnormal.
2) The wiring is defective.
3) The rush current prevention resistors
(R1, 5) are defective.
4) The electromagnetic contactor (52C)
is defective.
5) The diode stack (DS) is defective.
6) The reactor (DCL) is defective.
7) The INV board is defective.