Carrier AR TXHQB Series Owner's Manual & Installation Manual page 21

Problem
The unit is not working
The unit starts and
stops frequently
Poor heating
performance
Indicator lamps continue
Error code appears and
begins with the letters
as the following in
the window display of
indoor unit:
NOTE:
Possible Causes
The fuse is burned out
Remote control batteries are dead
There's too much or too little refrigerant
in the system
Incompressible gas or moisture has
entered the system.
The compressor is broken
The outdoor temperature is extremely
Cold air is entering through doors and
use
The unit may stop operation or continue to run safely. If the indicator lamps
Installation manual
Solution
Replace the fuse
Replace batteries
Wait three minutes after restarting the
unit
Turn timer off
Check for leaks and recharge the
refrigerant
Replace the compressor
Install a manostat to regulate the
are closed during use
Check for leaks, re-seal if necessary
and top off refrigerant
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