Service Manual

8. Troubleshooting
191
SMGB0079 rev.0 - 01/2013
8
Phenomenon Cause Check item
Action
(Turn OFF the main switch)
Cooling or heating proc-
ess with an abnormal
sound
Foreign particles inside of the fan casing Visually inspect it Remove the foreign particles
Indoor unit fan runner is hitting the casing Visually inspect it
Adjust the position of the fan
runner
Outdoor unit propeller fan is hitting the shroud Visually inspect it
Adjust the position of the
propeller fan
Abnormal sound from
the compressor
Faulty Installation
Check that each part is tightly
xed
Tightly x each part
Liquid ref. compression
Adjust the suction gas temp.
and pressure
Ensure superheat
Wear or breakage of
the internal comp.
parts
Abnormal Sound from the
Inside of the Compressor
Replace the compressor
No heating by the oil
heater
Check the Resistance (Oil
Heater, Fuse)
Replace the oil heater or the
fuse
Humming sound from the magnetic conductor
Check the surface of the
contacts
Replace the magnetic switch
Abnormal vibration of the cabinets Check each xing screw Tightly x each screw
Outdoor fan does not
operate when the com-
pressor operates
Obstacle at the outdoor fan Check the obstacles Remove the obstacles
Watching condition for the heating process
Wait for the switching of the
4-Way Valve (1 ~ 3 minutes)
If the 4-Way Valve does not
switch, check for insufcient
refrigerant
Indoor fan does not
operate when the com-
pressor operates
Discharge pressure does not increase higher than
1.5 Mpa due to the insufcient refrigerant
Check the operation pressure
*5)
Add the refrigerant
Disconnected Wiring for the Indoor Fan Check the wiring Connect the wiring correctly
N O T E
• *1):RefertosectionSelf-checkingoftheremotecontrolswitch.
• *2):RefertosectionSelf-checkingprocedureofPCBbymeansoftheRemoteControlSwitch.
• *3): Even if the remotecontrolswitchesare normal, the compressordoesnotoperate under the following
conditions:
1. Indoortemp.islowerthan21°Coroutdoortemp.Islowerthan-5°Cduringthecoolingprocess(DB).
2. Indoor temp. is higher than 27 °C (DB) or outdoor temp. is higher than 15 °C (WB) during the heating
process.
3. Whenacooling(orheating)processsignalisgiventotheoutdoorunitandadifferentmodeasheating(or
cooling)processsignalisgiventotheindoorunits.
4. Whenanemergencystopsignalisgiventooutdoorunit.
• *4):RefertochapterPiping work and refrigerant charge.
• *5):RefertochapterTest run.