Mitsubishi Electric CITY MULTI PUHY-P108 Service Handbook page 288

Error definition and error
Error Code
4220 Logic error If only the H/W error logic
4225 (Detail code circuit operates, and no
No.111) identifiable error is de-
tected.
4230 Heatsink over- In the case of 4230
4235 heat protection
In the case of 4235
4240 Overload pro- When the greater output
4245 tection current (Iac) than the
Imax (Arms), or THHS of
more than 90°C [194°F]
is detected for 10 min-
utes in a row.
P72 model
P96 model
P108 model
P126 model
P144 model
P168 model
P192 model
P204 model
P216 model
P234 model
Refer to section -8- "Inverter " under part [4] "Trouble shooting principal parts" for error codes related to the inverter.
detection method
In the case of 4220
(1) External noise
(2) Compressor INV board
failure
(3) G/A board failure
(4) IPM failure
(5) DCCT failure
In the case of 4225
(1) External noise
(2) FAN INV board failure
(1) Power supply environment Measure the power supply voltage.
When the heat sink
temperature(THH
S1) 95°C [203°F] or
higher is detected.
(2) Air passage blockage
When the heat sink
temperature
(3) Faulty wiring
(THHS5) 85°C
(4) THHS failure
[185°F] or higher is
detected.
(5) Compressor INV board
failure and cooling fan fail-
ure
(6) Cooling failure
(7) IPM failure
(1) Short cycle of the air pas-
sage
(2) Air passage blockage
(3) Power supply
Imax
40 Arms (4) Faulty wiring
50 Arms
(5) THHS failure
50 Arms
50 Arms
53 Arms
(6) Compressor INV board
50 Arms
failure and cooling fan fail-
50 Arms
ure
50 Arms
53 Arms
(7) Cooling failure
53 Arms
(8) Current sensor (ACCT)
failure
(9) Compressor Inverter cir-
cuit failure
(10) Compressor failure
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Cause Check method and remedy
Refer to 9 [4]-8-(2)[1].
Replace the G/A board.
Refer to 9 [4]-8-(2)[5].
Replace DCCT.
Refer to 9 [4]-8-(2) [7].
Ensure that the power supply volt-
age is 187V or more between each
phase.
Check that the heat sink cooling air
passage is not blocked.
Check cooling fan wiring.
Check THHS sensor resistor.
Check that a voltage of 208/230V is
applied to the compressor INV board
connector CNFAN while the inverter
is in operation.
Check the cooling fan operation un-
der the above operating conditions.
Refer to 9.[4].8.(2) [2] "Check for compres-
sor ground fault or coil error".
Refer to 9.[4].8.(2).[5] "Check the inverter
circuit trouble"
Check that the waste heat from the
outdoor unit fan is not short cycled.
Check that the heat sink cooling air
passage is not blocked.
Check whether the power supply
voltage is 187V or more.
Check cooling fan wiring.
Check THHS sensor resistance.
In the case of 4240: THHS1
In the case of 4245: THHS5
Check that a voltage of 208/230V is
applied to the compressor INV board
connector CNFAN while the inverter
is in operation.
Check the cooling fan operation un-
der the above operating conditions.
Refer to 9.[4].8.(4) "Current sensor
ACCT"
Refer to 9.[4].8.(2).[4] "Check wheth-
er the inverter is damaged"
->Check that the compressor
has not overheated during
operation.
Replace the compressor
when no fault is found.
[ IX Troubleshooting ]