(Air-Conditioning) Basic troubleshooting techniques 

Air conditioning problems can be easily addressed with the below step by step air conditioning check list.  Below the troubleshooting techniques range from checking fuses to your air filter.  Under no circumstances should anyone perform these tasks unless properly trained or licensed.  

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Air-Conditioning system does not start:                     

1. Have all voltages and fuses checked (if system is not operating) If fuses are blown-check for shorts or grounds before new fuses are installed. There was a reason for the fuses blowing-find it first.

2. Make sure the main breaker is "ON"

3. Check the thermostat set point and make sure the room temperature is above that setting. If the air in the room is cool enough the system may not need to run.

4. Keep all air filters and coils clean and unrestricted for proper air flow.

5. Make sure any belts have been checked and spares are on hand.

6. Safeties: Reset them 2-3 times maximum. If the system continues to trip the safety then call a specialized service technician.

Air-Conditioning-Start ups and Shut downs:

1. Do not shut off air-conditioning by main power disconnects. Use the thermostat when ever possible.

2. Make sure the outdoor units main power has been on for 24 hours prior to the initial season startup. This is to engage the compressor crank case heater and boil off any liquid refrigerant that might have built up over the cold winter months.

3. Shut Down for the season: Make sure to shut off the breaker to the outdoor condensing unit for the next 6-8 months. HINT: There is no need to pay for an oil heater if the system is not going to run for some time.

4. First time start ups should be done by a specialized service technician. Serious damage can occur if certain steps are not taken from the beginning.

Operating Adjustments: (Air-Conditioning)

1. If conditioned area is warm: Check thermostat and make sure it is set between 70-78 F. (average temperature range).

2. If conditioned area is warm: Check all air filters. Clean them once a month or at least quarterly (once a season)

3. Still Warm: call a specialized service technician.

4.  Cold ambient conditions must have some type of outdoor fan controls (air cooled) and some type of water regulating valves ( water cooled) for the chiller to properly operate and not cause oil and slugging problems.

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Professional Refrigeration Troubleshooter

The first hands on Chiller/HVAC/R troubleshooting handbook is out in publication. This is a must have book for you and your service technicians.  It will save you time and money along with passing on the vast knowledge of 60 years experience.

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This page was last updated on November 14, 2012 

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