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IM 796
Page 23
Service and Maintenance
Maintenance Schedule
Troubleshooting
If any malfunction of the unit is noted, immediately switch
off the power supply.
Check the following chart for possible causes/treatments.
If the trouble persists, please call your local
dealer/serviceman.
CAUTION
Disconnect the electrical power supply before performing
any service, maintenance or troubleshooting.
Item
Maintenance Procedures
Frequency
Indoor Air
Filters
Lift the return air grille and remove
the filters (See Figure 22). Clean
the filters by using a vacuum
cleaner or wash in lukewarm water
and soap. Rinse and dry before
reinstalling.
As required
to prevent
restriction of
air flow.
Indoor
Cabinet
Remove any dust on the grille or
panel by wiping it with a soft cloth
soaked in lukewarm water (below
40°C/104°F) and a mild detergent.
As required
to maintain
appearance.
Outdoor
Unit
Clean the louvers and coil. Be
careful not to bend or flatten the
aluminium fins. DO NOT use
cleaning fluids that might corrode
the coil.
As required
to prevent
restriction of
air flow.
Trouble
Possible cause/treatment
The compressor does not
operate.
Protection against frequent
starting. Wait for 3 to 4 minutes
for the compressor to start
operating.
Fans and compressor do not
operate.
Power failure.
Check fuse or circuit breaker.
Power supply disconnect off.
Delay timer may be set
incorrectly.
Air flow too low or insufficient
cooling/heating capacity.
Dirty air filters.
Open Doors or windows.
Adjust thermostat setting.
Discharge air flow has
bad odor.
Smoke, perfume, etc. may
have collected on the indoor
coil.
Clean coil.
Condensation on the return air
grille of the indoor unit.
Use dry mode. High humidity
in conditioned space.
Set temperature too low.
Increase temperature setting
and operate unit at high fan
speed.
Condensate leaking into room.
Condensate drain plugged.
Hissing sound from the unit
during operation.
Refrigerant fluid flowing into
the evaporator coil. Operate
for a while to see if sound goes
away.