Carrier 538FEQ009RBGA, Service Manual

Page: 45 / 94

45
4. ODU fan motor can not operate
Possible Causes
Discriminating Method
(Air Conditioner Status)
Troubleshooting
Wrong wire connection or poor connection Check the wiring status according to circuit diagram
Connect wires according to the wiring diagram to
ensure all wiring terminals are connected firmly.
Capacity of the ODU fan motor is damage. Wrong
wire connection or poor connection
Measure the capacity of the fan capacitor with a
universal meter and find that the capacity is out of
the deviation range indicated on the nameplate of
the fan capacitor.
Replace the capacity of fan
Power voltage is too or high
Use a universal meter to measure the power supply
voltage. The voltage is a little high or low
Suggest to equip with voltage regulator
Outdoor unit motor is damaged
When the unit is on, cooling/heating performance is
bad and the ODU compressor generates a lot of
noise and heat.
Change the compressor oil and refrigerant If no
better, replace the compressor with a new one.
5. Compressor can not operate
Possible Causes
Discriminating Method
(Air Conditioner Status)
Troubleshooting
Wrong wire connection or poor connection
Check the wiring status according to the circuit
diagram
Connect wires according to the wiring diagram to
ensure all wiring terminals are connected firmly
Capacity of compressor is damaged
Measure the capacity of the fan capacitor with a
universal meter and find that the capacity is out of
the deviation range indicated on the nameplate of
the fan capacitor.
Replace the compressor capacitor
Power voltage is too low or high
Use a universal meter to measure the power supply
voltage. The voltage is a little high or low
Suggest to equip with a voltage regulator
Compressor coil is burnt out
Use a universal meter to measure the resistance
between the compressor terminals and its 0
Repair or replace the compressor
Cylinder of compressor is blocked Compressor can not operate Repair or replace the compressor
6. Air conditioner is leaking
Possible Causes
Discriminating Method
(Air Conditioner Status)
Troubleshooting
Drain pipe is blocked Water leaking from indoor unit Eliminate the foreign objects inside the drain pipe
Drain pipe is broken Water leaking from drain pipe Replace drain pipe
Wrapping is not tight
Water leaking from the pipe connection place of
indoor unit
Wrap it again and bundle it tight
7. Abnormal sound and vibration
Possible Causes
Discriminating Method
(Air Conditioner Status)
Troubleshooting
When turning on or off the unit, the panel and other
parts expand and there is an abnormal sound
The unit may make a crackling or popping noise.
Normal phenomenon. Abnormal sound will
disappear after a few minutes
When turning on or off the unit, there is an
abnormal sound due to the flow of refrigerant inside
the air conditioner
Water--running sound can be heard
Normal phenomenon. Abnormal sound will
disappear after a few minutes
Foreign objects inside the indoor unit or there are
parts touching together inside the indoor unit
There is an abnormal sound coming from the indoor
unit
Remove the foreign objects. Adjust all parts
positions of indoor units, tighten screws and stick
damping plaster between connected parts.
Foreign objects inside the outdoor unit or there are
parts touching together inside the outdoor unit
There is an abnormal sound coming from the
outdoor unit
Remove the foreign objects. Adjust all parts
positions of outdoor units, tighten screws and stick
damping plaster between connected parts.
Abnormal shake of compressor Outdoor unit gives out abnormal sound
Adjust the support foot mat of compressor. Tighten
the bolts
Abnormal sound inside the compressor Abnormal sound inside the compressor
If add too much refrigerant during maintenance,
reduce refrigerant properly, Replace compressor for
other circumstances.