Sharp AY-XPM12FR Operation Manual page 22

BEFORE CALLING FOR SERVICE
If the unit appears to be malfunctioning, check the following points before calling for
service.
IF THE UNIT FAILS TO OPERATE
Check to see if the circuit breaker has tripped or the fuse has blown.
IF THE UNIT FAILS TO COOL (OR HEAT) THE ROOM EFFECTIVELY
Check the filters. If dirty, clean
them.
Make sure windows and doors
are closed tightly.
IF THE UNIT FAILS TO RECEIVE THE REMOTE CONTROL SIGNAL
Check whether the remote con-
trol batteries have become old
and weak.
Please call for service when TEMPERATURE INDICATOR on the indicator panel blink.
Check the outdoor unit to make
sure nothing is blocking the air in-
let or outlet.
A large number of people in the
room can prevent the unit from
achieving the desired tempera-
ture.
Try to send the signal again with
the remote control pointed prop-
erly towards the unit's signal re-
ceiver window.
E-20
Check the thermostat is proper
setting.
Check whether any heat-gen-
erating appliances are operat-
ing in the room.
Check whether the remote con-
trol batteries are installed with
the polarities properly aligned.