Develop a rule-based expert system for diagnosing an air conditioning system. An air conditioning system is a complex device with many areas and parts which are not accessible to an untrained person. Despite this, several things can be checked before calling for service. This expert system should diagnose simple problems which you may be able to repair yourself, and thus avoid an unnecessary call to the service company.

An air conditioning system may have the following problems: unit freezing, leaking water, not cooling, and not running. See a troubleshooting manual for details. You can also find some useful information on the following website: http://www.accheckup.com/trouble.htm