Prof. Koldenhott's O.O.P.$! Method of Troubleshooting is an easy to remember              and fun way to approach the troubleshooting of air conditioning systems.

Observational Checks:  Use all your senses!  Check the thermostat, air filter, blower wheel, evap coil (OK, maybe as a last resort!), registers and grilles , ductwork (Again, as a last resort), line and control wiring connections, outdoor coil, line set and insulation, and the condition of all other components. Clean or replace air filter, clean blower wheel, clean evap coil and condenser coil as necessary, and open registers and grilles before operation of system.

Operational Checks:  Operate the system and record the following: Line and control voltage; Start and Run current; Temperatures (Outdoor Air, Return Air, Supply Air, Suction Line, and Line Liquid Line); Suction Pressure and Discharge Pressure; Calculate the following:  Delta T; Superheat; Subcooling; and Compression Ratio.  Determine External Static Pressure.

Pinpoint the Problem(s):  During the Observational Checks and Operational       Checks the problem or problems have probably been revealed.  This is where training and experience pays off.  Sometimes serendipity comes into play!  As the problem(s) are found, it is fun to say, "OOPS!"  If the customer questions that statement, just assure them that the elusive problem has been found - not that you've made a mistake.

$olve the Problem(s):  Notice the Dollar Sign?  This is where you make your well-deserved money and profit for the boss.  This is what makes your customers happy - making them feel comfortable again - and they're more than welcome to pay for the priviledge.  Solving the Problem may mean just cleaning things up a bit...or a little tweaking...or replacing faulty components...or changing the whole system out with one that's more energy efficient.

Exclaim your success!  Yes, it doesn't hurt to toot your own horn!  It's a way to build the customer's confidence in your work.  Even if you're a technician, aren't you really building your own client base - those that like your work and will ask for you the next time around?  Be sure to ask for referrals (neighbors, friends, associates,and relatives.)

Thank you for considering Prof. Koldenhott's O.O.P.$ ! Method of Troubleshooting.  If you found this helpful, won't you let me know by email - profkoldenhott@tx.rr.com       I'll eventually complete a PowerPoint presentation of a more thorough O.O.P.$.! Method so let me know if you want on the list to receive the presentation.

Disclaimer:  The foregoing presentation is the expressed opinion of Terry L. Robinson aka Prof. Koldenhott and is derived from years of training and experience.  It is intended to be used by trained and experienced HVACR technicians working in a safe manner.  No warranties or guarantees are extended in its use.