Mitsubishi Electric PURY-P200 Service Handbook page 134

Checking code Meaning, detecting method
4115 Power supply The frequency cannot be
sync signal determined when the power is
abnormality switched on.
(The power supply's frequency
cannot be detected. The
outdoor fan cannot be controlled
by phase control.)
4116 Fan speed [ LOSSNAY ]
abnormality 1. The motor keep running even
(motor if the power is OFF.
abnormality) 2. The thermal overload relay is
ON. (Only for the three-phase
model)
[ Indoor unit ]
If detected less than 180rpm
or more than 2000rpm, the
indoor unit will restart and
keep running for 3 minutes. If
detected again, the display
will appear.
4220 Bus voltage If Vdc
4225 drop operation. (Software detection)
abnormality
(Error details
No.108)
(1) There is an open phase in
the power supply.
(2) A fuse is defective.
(3) Faulty wiring.
(4) The circuit board is defective.
(1) Defective board.
(2) Motor malfunction.
(3) Solenoid switch malfunction.
289V is detected during (1) Power environment.
(2) Voltage drop detected.
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Cause Checking method & Countermeasure
Check before the breaker, after
the breaker or at the power
supply terminal blocks TB1, and
if there is an open phase,
correct the connections.
If F01 or F02 on the MAIN board
is meltted, (Resistance between
both ends of the fuse is ∞),
replace the fuses.
Check voltage between the pin-5
on the main board connector
(CN20), between the pin-1 and
the pin-3 on CN21. When the
voltage is not the same as the
power source voltage (380-415V),
the wiring is faulty.
If none of the items in (1) to (3)
is applicable, and if the trouble
reappears even after the power
is switched on again, replace
the MAIN board (when replacing
the circuit board, be sure to
connect all the connectors,
ground wires, etc. securely).
Replace the board.
Check for the motor and the
solenoid switch.
Check whether the unit makes
an instantaneous stop when the
detection result is abnormal or a
power failure occurs.
Check whether the power
voltage
<In the case of 4220>
Check the voltage of the
connector (CNDC2) on the INV
board.
→ Replace the INV board when
there is no voltage drop.
→ Check the followings when
there is a voltage drop.
1Check the voltage of CN52C
on the main board
→ Refer to (3)
2Check whether 52C1 works
normally → Refer to (4)
Or check 52C1-connecting
piping.
3Check for the diode stack
→ Refer to (5)
4Check for the wiring and the
connectors between the
CNDC2 on the INV board and
the CNDC1 on the G/A board.
Replace G/A board when no fault
is found for the above 1~4.
289V across all phases.