SiUS121827E
General Problem Symptoms and Check Items
Part 6 Service Diagnosis
145
1. General Problem Symptoms and Check Items
Symptom
Check Item
Details
Reference
Page
None of the units
operates.
Check the power supply.
Check if the rated voltage is supplied.
—
Check the types of the indoor
units.
Check if the indoor unit type is
compatible with the outdoor unit.
—
Check the outdoor temperature. Heating/cooling operations are not
available when the outdoor temperature
is out of the operation limit. Check the
reference page for the operation limit.
Diagnose with remote controller
indication
—
For RA Indoor Unit:
Check the wireless remote
controller addresses.
Check if address settings for the wireless
remote controller and indoor unit are
correct.
For SA Indoor Unit:
Check the wireless remote
controller addresses.
If using 2 remote controllers for
1 indoor unit, check MAIN/SUB
setting.
Check if address settings for the wireless
remote controller and indoor unit are
correct.
Check if the MAIN/SUB setting is
correct.
Operation sometimes
stops.
Check the power supply.
A power failure of 2 to 10 cycles can stop
air conditioner operation. (Operation
lamp OFF)
—
Check the outdoor temperature. Heating/cooling operations are not
available when the outdoor temperature
is out of the operation limit. Check the
reference page for the operation limit.
Diagnose with remote controller
indication.
—
Some indoor units do
not operate.
Check the type of the indoor
units.
Check if the indoor unit type is
compatible with the outdoor unit.
—
Diagnose with remote controller
indication
—
Units operate but do not
cool, or do not heat.
Check for wiring and piping
errors in the connection
between the indoor and outdoor
units.
Check the piping.
Conduct the wiring error check described
on the product diagnosis nameplate.
—
Check for thermistor detection
errors.
Check if the thermistor is mounted
securely.
—
Check for faulty operation of the
electronic expansion valve.
Set all the units to cooling operation, and
compare the temperatures of the liquid
pipes to see if the each electronic
expansion valve works.
—
Diagnose with remote controller
indication.
—
Diagnose by service port
pressure and operating current.
Check for refrigerant shortage.
Large operating noise
and vibrations
Check the output voltage of the
power module.
—
Check the power module.
—
—
Check the installation condition. Check if the required spaces for
installation (specified in the installation
manual) are provided.
—
Содержание 4MXL-T Series
Страница 107: ...SiUS121827E SA Indoor Unit Functions Part 4 Functions and Control 101 FFQ Series Emergency operation switch R24077 ...
Страница 182: ...Troubleshooting for RA Indoor Unit SiUS121827E 176 Part 6 Service Diagnosis Reference Check No 11 Refer to P 235 ...
Страница 190: ...Troubleshooting for SA Indoor Unit SiUS121827E 184 Part 6 Service Diagnosis Reference Check No 02 Refer to P 233 ...
Страница 249: ...SiUS121827E Check Part 6 Service Diagnosis 243 R6000583 1 2 3 4 Multimeter Front side Rear side ...
Страница 288: ...Piping Diagrams SiUS121827E 282 Part 8 Appendix 1 2 Outdoor Unit 5MXS48TVJU 4MXL36TVJU 3D117817 3D118311 ...
Страница 298: ...Operation Limit SiUS121827E 292 Part 8 Appendix 4 Operation Limit 5MXS48TVJU 4MXL36TVJU 3D048149D 3D101428 ...