Fujitsu AOTG30KMTC, Service Manual, Page: 97 / 199

3-4. No cooling/No heating
Forecast of cause
Indoor unit error
Outdoor unit error
Effect by surrounding environment
Connection pipe/Connection wire failure
Refrigeration cycle failure
Check point 1. Check Indoor unit
• Does Indoor unit fan run in the HIGH mode?
• Is air filter dirty?
• Is heat exchanger clogged?
• Check if energy save function is operated.
↓
Check point 2. Check outdoor unit operation
• Check if outdoor unit is operating.
• Check any objects that obstruct the air flow route.
• Check if heat exchanger is clogged.
• Is the valve open?
↓
Check point 3. Check site condition
• Is capacity of Indoor unit fitted to the room size?
• Any windows open or direct sunlight?
↓
Check point 4. Check Indoor/ Outdoor installation condition
• Check connection pipe (specified pipe length and pipe diameter?)
• Check any loose or removed communication line.
→ If there is an abnormal condition, correct it by referring to the installation manual or the “DESIGN
& TECHNICAL MANUAL”.
↓
Check point 5. Check Refrigeration cycle
• Check if strainer is clogged (Refer to the figure below).
• Measure gas pressure, and if there is a leakage, correct it.
• Check the electronic expansion valve.
Refer to outdoor unit Electronic Expansion Valve (EEV) in
"Service parts in-
formation" on page 03-75.
• Check compressor.
Refer to compressor in
"Service parts information" on page 03-75.
Refer to inverter compressor in "Service parts information" on page 03-75.
NOTE: When recharging the refrigerant, make sure to perform vacuuming,
and recharge the specified amount.
MPa MPa
↓
End
3-4. No cooling/No heating
- (03-59) -
3. Troubleshooting without error code
TROUBLESHOOTING TROUBLESHOOTING