III - 2
Service Procedures
3
SM830063
1. Troubleshooting
This section explains:
❏ What the LED codes mean
❏ What the remote controller display (screen) messages mean
❏ How to use the flow charts to find and solve problems
❏ How to use the self-diagnostic tests to find parts which don’t work right
This unit is made to be trouble free, and not need much service. However, with time, moving parts wear out, electronic
components break down, and sometimes misuse damages the unit.
The purpose of this section is to help you when the unit does not work properly.
Sometimes your experience will tell you right away where to look for a problem, and when you find it you will know how
to fix it at once.
Often, however, all you have is a
symptom
like “poor cooling” or “outside fan doesn’t come on.” Now you must find out
the cause of the problem, and then how to fix it. This section provides several ways to help you go from the symptom to
the cause and then the solution.
The first chart, General Troubleshooting Flow Chart is divided into two sections: Poor heating and Poor Cooling.
Under each heading you will find the main things that can go wrong and cause either of these problems. Sometimes you
can start with this chart and find the problem right away, but often you will come here for more suggestions after you
have looked at the error code on the remote controller display. This chart gives you the “big picture” of problems and
solutions.
The other main tool we explain here is the use of the Alarm Messages. When a certain part fails or a safety device has
shut the unit down, any alpha-numeric codes appear on the display to guide you to the problem.
By understanding the code you can often go right to the problem area and then, with this manual and your knowledge of
air conditioning, find the solution.
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