Troubleshooting Guide - Carrier 38BNB Owner's Manual

Your air conditioner is very reliable and requires little maintenance. However, the air conditioner's proper operation can be interrupt-
ed by a malfunction in the electrical system or by incorrect operation. You can try to overcome these simple malfunctions yourself, with
the aid of the following table and the malfunction displays shown in Fig. 16.
PROBLEM
Air conditioner does not work.
POWER indicator light is not lit.
FILTER indicator light is lit.
Air conditioner is working, but
does not perform the required
operation.
(ON)/(AIR COND). Indicator light is
continuously flashing.
Various indicator lights
behave differently than
shown in Fig. 13.
Air conditioner does not operate
with the remote controller.
The remote controller of another
air conditioner interferes with
your air conditioner's operation.

TROUBLESHOOTING GUIDE

POSSIBLE CAUSE
• No command is transmitted to air conditioner.
• Air conditioner did not receive transmitted
command.
• Air conditioner is not properly connected.
• Automatic interrupter switched Off.
• Fuse burned.
• Filters require cleaning.
• Desired temperature setting is higher than
room air temperature when operating in the
COOLING mode.
• Desired temperature setting is lower than room
air temperature when operating in the HEATING
mode.
• The control system is malfunctioning.
• There is no direct line of sight between
the remote controller and the air conditioner.
• The air conditioner has reached the desired
temperature and stopped the compressor oper-
ation (thermostat function).
• Incorrect operation or malfunction.
• In 40BN036 the operation push button is in
AUTO or OFF. (For 40BN018,024,030 go to
next bullet.)
• The remote controller batteries are weak.
• The remote controller is malfunctioning.
• Both remote controllers are transmitting
on the same wavelength.
10
SOLUTION
• Press the On/Off (Transmission) button.
• Make sure that remote controller is pointed at air
conditioner during command transmission.
• Check electrical connection.
• Reset interrupter.
• Replace fuse.
• Remove and clean filters.
• For 40BN036 move operation switch to OFF
position for 5 sec. and return it to REMOTE.
• For 40BN018,024,030 press the operation push
button continuously for 5 seconds.
• Lower the desired temperature setting.
• Raise the desired temperature setting.
• For 40BN036 slide the operation switch to OFF
position for 5 sec. and return it to REMOTE.
• For 40BN018,024,030 press the operation push
button, continuously for 5 seconds. Press once
again to operate the air conditioner.
• For 40BN018,024,030 press the operation push
button continuously for 5 seconds.
• For 40BN036 slide the operation slide switch
to OFF position for 5 sec. and return it to
REMOTE.
• Restart the air conditioner, if the problem per-
sists, call service personnel.
• For 40BN036 turn the operating switch to
REMOTE position.
• Replace the batteries.
• Turn the air conditioner On and OFF using the
operation push button or slide switch.
• Call service personnel.