![background image](http://html.mh-extra.com/html/daikin/fdmq12rvju/fdmq12rvju_service-manual_501418113.webp)
SiUS091601EA
General Problem Symptoms and Check Items
Part 6 Service Diagnosis
108
1. General Problem Symptoms and Check Items
Symptom
Check Item
Measures
Reference
Page
The unit does not
operate.
Check the power supply.
Check if the rated voltage is supplied.
—
Check the type of the indoor unit.
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.
—
Check the remote controller
addresses.
Check if address settings for the remote controller
and indoor unit are correct.
Operation sometimes
stops.
Check the power supply.
A power failure of 2 to 10 cycles stops 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.
—
The unit operates but
does not cool, or does
not heat.
Check for wiring and piping errors in
the connection between the indoor
unit and outdoor unit.
—
—
Check for thermistor detection errors. Check if the thermistor is mounted securely.
—
Check for faulty operation of the
electronic expansion valve.
Set the unit to cooling operation, and check the
temperature of the liquid pipe to see if the
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.
—
Summary of Contents for FDMQ12RVJU
Page 18: ...SiUS091601EA 13 Part 2 Specifications 1 Specifications 14 Part 2 Specifications ...
Page 198: ...Check SiUS091601EA 193 Part 6 Service Diagnosis 18 24 class R24538 1 2 3 4 Multimeter ...
Page 201: ...SiUS091601EA Check Part 6 Service Diagnosis 196 18 24 class R24539 DC DC W V U ...
Page 229: ...SiUS091601EA Piping Diagrams Part 8 Appendix 224 RXL15QMVJU RXL18UMVJU 3D100007 3D123368 ...
Page 230: ...Piping Diagrams SiUS091601EA 225 Part 8 Appendix RXL24UMVJU 3D107985A ...