7-­-4. T Rouble D Iagnosis O F C Ompressor; 7-­-5. T Rouble D Iagnosis O F E Lectric F Ilter B Oard; 7-­-6. T Rouble D Iagnosis O F E Lectric C Ommunication - Hisense AS-07UR4SYDDB15 Service Manual

compressor maintains at the current level, which may decrease as the case requires while cannot rise.
The indoor and outdoor fans run.
Condition for ending anti-overload prohibition of frequency of outdoor coiled pipe: if the temperature of
outdoor coiled pipe drops below "temperature to release the anti-overload state of outdoor coiled pipe",
anti-overload prohibition of frequency of outdoor coiled pipe will be released.
7-­‐4. T rouble D iagnosis o f C ompressor
Judging the connecting terminals of inverter compressor:
It is impossible to identify terminals U, V and W of inverter compressor with multi-meter. Just connect
the terminals in the same way as the original unit when replacing the compressor. A wrong connection will
lead to reverse and loud noise of the compressor.
Resistance of compressor coil:
Measure the resistance between any two terminals, which are about a few Ohms, three phases
having the same resistance.
7-­‐5. T rouble D iagnosis o f E lectric F ilter B oard
Visual examination: as the circuit is simple, the connection may be checked visually to see whether
any loose or poor connection.
Voltage test: the voltage at the input end shall be the same as the voltage at the output end.
7-­‐6. T rouble D iagnosis o f E lectric C ommunication
Step one: to determine whether the connecting cables and tether cables of indoor/outdoor units are
correctly wired. If not, change wiring order and test connection.
Step two: to determine whether there is loose connection.
Fasten the connection in the case of loose connection and then conduct verification.
Step three: measure the voltage between SI and N with multi-meter and see whether the voltage
fluctuates between 0V and 24V. Please directly replace indoor and outdoor control boards if there are not
voltage fluctuations.
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