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1. Error Code
4225
Abnormal bus voltage rise (Indoor unit)
2. Error definition and error detection method
If Vdc
425V is detected during inverter operation.
3. Cause, check method and remedy
(1) Different voltage connection
Check the power supply voltage on the power supply terminal block (TB2).
(2) INV board failure
If the problem recurs, replace the INV board.
Refer to section [8] Troubleshooting, item 3. DC fan motor (fan motor/INV board) for error codes related to the inverter.
(page 47)
1. Error Code
4225
Logic error (Indoor unit)
2. Error definition and error detection method
H/W error
If only the H/W error logic circuit operates, and no identifiable error is detected.
3. Cause, Check method and remedy
(1)
External noise
(2)
INV board failure
Refer to section [8] Troubleshooting, item 3. DC fan motor (fan motor/INV board) for error codes related to the inverter.
(page 47)
1. Error Code
4235
Heatsink overheat protection (Indoor unit)
2. Error definition and error detection method
When the heat sink temperature (THHS) remains at or above 85°C [185°F] is detected.
3. Cause, check method and remedy
Cause
(1)
Air passage blockage
(2)
Fan motor error
(3)
THHS failure
(4)
INV board fault
Refer to section [8] Troubleshooting, item 3. DC fan motor (fan motor/INV board) for error codes related to the inverter.
(page 47)
HWE10170
Cause
Check that the heat sink cooling air passage is not blocked
Check the fan motor for proper operation (sound, vibration, and rotation).
If any problems were found, check the items listed in sections 2 [3] and [4].
->Refer to [8] 3.2[3][4].(page 49)
If the problem persists after resuming operation, replace the THHS sensor.
If no problems were found with items (1) through (3) and the same error is de-
tected after resuming operation, replace the INV board.
Check method and remedy
If the problem recurs when the unit is put into opera-
tion, replace the INV board.
Check method and remedy
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23
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