Fujitsu GENERAL AOHG18KMTA, Service Manual

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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 if EEV open or there is a capillary tube defect.
Refer to outdoor unit Electrronic Expansion Valve (EEV) or Capillary tube in
"Service parts information" on page 03-48.
• Check compressor.
Refer to compressor in "Service parts information" on page 03-48.
Refer to inverter compressor in "Service parts information" on page 03-48.
NOTE: →hen recharging the refrigerant, make sure to perform vacuuming,
and recharge the specified amount.
MPa MPa
End
3-4. No cooling/No heating
- (03-44) -
3. Troubleshooting without error code
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