Troubleshooting Information - Haier HW-12C03 Service Manual

2.Troubleshooting Information

To avoid risk of electrical shock, personal injury, or death, disconnect electrical power source to unit and
discharge capacitor through a 10,000 ohm resistor before attempting to service, unless test procedures require
power to be connected. Ensure all ground wires are connected before certifying unit as repaired and/or
operational.
Units covered in this manual are polarized. Reversing polarity of a unit or any of its components will cause
damage. To avoid reversing polarity, any wires disconnected or removed during service must be reconnected to
the same location. To ensure wires are reconnected to the proper location, tag or otherwise mark the wires
before disconnecting or removing.
Tools and Equipment
Accurate diagnosis and repair of malfunctioning air
conditioners requires proper tools and equipment. In
addition to standard hand tools (screw drivers, pliers,
sockets, etc.), the following equipment is required:
Thermocouple type temperature tester, with sufficient
range to meet all testing and measuring requirements.
Multimeter(combination voltmeter, ammeter, and
ohmmeter) for reading current loads during start up
and normal operation, verifying voltage levels, and
testing various components for continuity.
Accurate leak detector, to check for refrigerant leaks.
Vacuum pump capable of removing all non-condensable
material in sealed system.
Charging manifold and related equipment to determine
and replenish exact refrigerant charges.
Recovery cylinder and related equipment to recover
and store refrigerant charge in sealed system.
Additional tools and equipment may be required.
WARNING
CAUTION
Troubleshooting Table
Troubleshooting table on following pages contains
symptoms that may be seen in a malfunctioning air
conditioner. Each group of symptoms is accompanied by
one or more possible causes. Each possible cause is
accompanied by a remedy, or a test to determine if
suspect component(s) are working properly.
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