Service & Maintenance

Fan and System Troubleshooting

October 9, 2006
This article is a guide for identifying the most common problems encountered in fans and air-handling systems. This is often an "art" and not a "science" because many problems are subtle and hard to diagnose.
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Btu Buddy 42: 50-Ton System With Defective Solenoid Valve

September 18, 2006
In this installment of the Btu Buddy series, the customer's building is warmer than normal. Btu Buddy notes that this system has capacity control. Bob finds that one of the solenoid valves is not working.
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Air Conditioning Freezing

September 4, 2006
There are a variety of things that can cause air conditioning freezing. The first thing to do is see if the indoor (evaporator-air handler) fan and compressor are both running at the same time.
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Btu Buddy 41: Stopped Up Condensate Line

August 21, 2006
In this edition of the Btu Buddy series, Bob is dispatched to a home with water on the basement floor around the air handler. He determines that there is a condensate drain problem and he recommends installation of a condensate pump.
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Troubleshooting HVACR Systems Using Superheat and Subcooling

August 7, 2006
Regardless of your experience, to troubleshoot the system it is essential that you have a solid understanding of the fundamentals of refrigeration - including the principles of superheat and subcooling. You also need to have the right tools and know-how to apply these principles to use the tool quickly and efficiently.
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Btu Buddy 40: High Head Pressure, Air in System

July 24, 2006
In this installment of the Btu Buddy series, Bob is on a no-cooling call where the a/c system had just been repaired due to a refrigerant leak. Unfortunately, he discovers air in the system because it had not been evacuated.
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Air Conditioning Troubleshooting

July 10, 2006
Are you a technician that needs to do some troubleshooting on a totally dead air conditioning unit? Grab your tools and crank up the can-do attitude. Here are some tips for troubleshooting that air conditioner.
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Btu Buddy 39: Burned Transformer Due to Shorted Coil in Relay

June 26, 2006
In this edition of the Btu Buddy series, Bob goes on a service call and finds a failed transformer in an electric furnace. He discovers that the heat relay in the system has a shorted coil.
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Stop Blowing Hot Air

June 12, 2006
If you want to keep equipment operating in peak condition, make sure you select the proper replacement fan blade when replacing a worn or damaged one. Proper fan blade selection can sometimes get overlooked.
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Practical Ice Maker Troubleshooting Tips

May 29, 2006
Ice maker troubleshooting is easier if you take it one step at a time. In this article the author goes step-by-step through the most common ice maker troubleshooting calls.
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