Jim Johnson

Jim Johnson is the director of training for Technical Training Associates, a Tucson, Ariz.-based firm that provides HVACR technician training DVDs/videos, E-books, and workshops. For more information, call 520-625-6847 or visit www.techtrainassoc.com.

Figure One: Diagram of an electric furnace.

Troubleshooting Puzzle: An Electric Furnace That’s Not Performing

Jim Johnson

October 9, 2021

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The equipment in this month’s troubleshooting problem is an electric furnace that has been in service for at least ten years and has no service history.

Troubleshooting Puzzle: A Heat Pump That’s Not Heating Enough

Jim Johnson

September 2, 2021

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In this troubleshooting situation, the equipment is a package unit heat pump that isn’t properly heating the customer’s home.

Troubleshooting Puzzle: A Reach-In Freezer That’s Not Keeping Product Frozen

Jim Johnson

August 12, 2021

One Comment

In this troubleshooting situation, a restaurant manger is calling for service on a reach-in freezer, and the complaint is that the unit “isn’t freezing things hard.”

Troubleshooting Puzzle: A Light Commercial Air Conditioner That’s Blowing Warm Air

Jim Johnson

July 10, 2021

One Comment

In this troubleshooting situation, the customer’s complaint is that their office air conditioner is “not cooling at all.”

Troubleshooting Puzzle: A Comfort Cooling System That’s Not Performing

Jim Johnson

June 13, 2021

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In this month’s troubleshooting situation, the equipment that needs servicing is a split system and the refrigerant flow control is handled via an EEV.

Troubleshooting Puzzle: A Convenience Store That’s Not Comfortable

Jim Johnson

May 8, 2021

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The customer is complaining that the temperature inside their small convenience store won’t get comfortable in the warmer part of the day.

Troubleshooting Puzzle: A Split System With Ongoing Complaints

Despite several service calls, the system isn’t keeping the homeowner comfortable

Jim Johnson

April 9, 2021

No Comments

The equipment in this month’s troubleshooting situation is a split system that has only been in service for two years, but there is a lot of history.

Troubleshooting Puzzle: An Electric Furnace That’s Running Too Long

Jim Johnson

March 12, 2021

No Comments

Our troubleshooting problem involves a complaint from a customer who is concerned that their electric furnace is running excessively and wasting energy.