Gree GUHD series - Page 100

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3 Status Indicating Lamp of the Electric Control Box of the Outdoor Unit
There are three independent indicating lamps on the electric control box of the outdoor unit, and they
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on again.
2.2.2 Analysis to the Common After-Sales Faults
1. Stalling of the Outdoor Fan Motor
Method of testing the AC fan motor: pull out the terminals of the fan motor, then measure the resistance
between the red, brown, and black wires with the universal meter; the normal resistance is several hundreds
ohms, if not, it indicates there is a open circuit and the fan motor is defective.
If the measured resistance of the fan motor is abnormal, please replace the fan motor; if not, please
replace the control of the outdoor unit.
2. Temperature Sensing Fault
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Replace the corresponding temperature sensor according to the error code. If possible, pull out the
temperature sensor and measure the resistance between its two ends to see if the it is defective or not.
If the fault still exists afte r the replacement of the temperature sensor, then please replace the electric
control box of the outdoor unit.
3. IPM Protection(H5)
a.Pull out the power plug for three minutes and then plug it again, in which case, if H5 appears in no
time, check if the terminals of the compressor are improperly connected or loosened; if not, replace the
electric control box of the outdoor unit; if the fault still exists, then it indicates the compressor is defective and
should be replaced.
b. When H5 appears after the unit has run for a period of time, then it is necessary to see if the running
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to see if the wiring of the compressor is reverse, the screws of the module is tightened, or if the compressor
is defective etc; If the fault is beyond the statement above, please replace the electric control box of the
outdoor unit.
4. Heating Failure
1. Under the heating status, measure the voltage between two wires of the four-way valve with a
universal meter. The testing points are 4V and AC-L2. If the measured voltage is not about AC230V, then it
indicates that the electric control box of the outdoor unit is defective and should be replaced.
2. If the measured voltage is about AC230V, then cut off the power supply and pull out these two wires
of the four-way valve and measure the resistance between the test points to see if it is about 1-2K. If it is
much larger, it indicates that there is a open circuit among the coils of the four-way valve which then should
be replaced.
3. If the coils of the four-way valve is normal, then the failure may be caused by the system abnormity.
5. Cooling Failure
The cooling failure is posed generally when the Relay K5’s contactor of the four-way valve of the
outdoor unit’s electric control box is bonded, and it can be checked out by the universal meter.
2.2.3 Solutions to the Unsolved Faults after the Replacement of the Electric Control Box
1 .After the Replacement of the Electric Control Box of the Outdoor Unit
If the faults still exist after the replacement of the electric control box of the outdoor unit, please take a
check to see if the communication line, temperature sensor, reactor, fan motor, or compressor is normal or
not.
Communication line: check if the communication line, live line, or neutral line are connected improperly
or the contactor of the terminals are not good. If the line is extended, then check if the joint is in good
condition.
Temperature sensor: measure the grounding resistance between the points 3.3V and IPM15V (the
testing method is same as above); if the grounding is shortcut, please check if each temperature sensor is
damaged or if there is arcing trace on its outer housing or metal ends
Reactor: if the communication error remains after the replacement of the electric control box, then pull
out the two terminals of the reactor and measure the resistance between them with a universal meter; if the
measure valve is about several ohms, it indicates the terminals of the reactor is likely to break off.
Fan motor: pull out the terminals of the fan motor and measure the resistance between the red, brown