[8-9 Troubleshooting Inverter Problems ]
- 237 -
HWE12050 GB
8 Troubleshooting Based on Observed Symptoms
8-9-5 Checking the Inverter for Damage during Compressor Operation
8-9-6 Checking the Fan Motor for Ground Fault and Coil Resistance Problems
8-9-7 Checking the Fan Board Error Detection Circuit at No Load
Items to be checked Phenomena Remedy
Put the outdoor unit into operation.
Check the inverter output voltage af-
ter the inverter output frequency has
stabilized.
1) Overcurrent-related problems occur im-
mediately after compressor startup.
Error code : 4250
Detail code : 101, 102, 106, 107
a. Check items8-9-2 through 8-9-
4 for problems.
b. Check that high and low pres-
sures are balanced.
c. Check that no liquid refrigerant
is present in the compressor.
Go to "d." when the problem
persists after compressor start-
up was repeated several times.
If normal operation is restored,
check the belt heater for prob-
lems.
d. Check that there is a pressure
difference between high and
low pressures after compres-
sor startup.
Check the high pressure with
LED monitor for changes.
Replace the compressor if
there is no pressure difference.
(the compressor may be
locked.)
2) There is a voltage imbalance between
the wires after the inverter output voltage
is stabilized.
Greater than the larger of the following
values: imbalance of 5% or 5V
Replace the INV board if there is a
voltage imbalance.
Check the belt heater for problems if
there is no voltage imbalance.
When the error occurred, liquid
refrigerant may have been present
in the compressor.
Items to be checked Phenomena Remedy
Remove fan motor winding. Check
insulation resistance and coil resis-
tance.
1) Fan motor insulation failure.
If < 1 M, Defect.
Change fan motor.
2) Fan motor wire failure.
Target coil resistance: Approx. 10 .
(Changes with temperature)
Change fan motor.
Items to be checked Phenomena Remedy
(1) Turn off breaker.
*Turn power off without fail.
1) Electrical current over load error.
Check code: 4255, 4256
Detail code: 101, 104
Change fan board.
(2) Remove fan board CNINV
and CNSNR connectors.
2) Logic error
Check code: 4255, 4256
Detail code:111
Change fan board.
(3) Turn on breaker. 3) Position error on start up
Check code: 5305, 5306
Detail code: 132
Normal
*After checking, return connector
CNINV & CNSNR.
(4) Operate unit.
To Next Page
Loading...
