Carrier 619FB Service Manual page 45

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