How a HEP Technician Restored Cool Comfort to a Knoxville Home

Find out about Heating and Air Conditioning, HEP’s service in Knoxville, and our expertise in Heating and Air Conditioning in Knoxville.

The Customer’s Cooling Challenge

A homeowner in Knoxville contacted HEP when their heat pump stopped cooling mid-summer. The indoor air was warm, and the outdoor unit wouldn’t turn on unless the technician jumped the controls manually. It was clear the system couldn’t circulate refrigerant or run automatically—a frustrating situation on a hot day.

Our Diagnostic Process

When the HEP technician arrived, they performed a step-by-step check:

1. Verified power and controls. Jumping the thermostat wires showed the blower motor could run, but not in normal mode.
2. Checked refrigerant levels. Pressures were far too low, meaning the cooling circuit wasn’t working.
3. Monitored electrical components. A digital multimeter was used to ensure the safety switches and sensors were operating correctly.

Proper diagnostics with up-to-date tools ensure a precise repair plan.

Board Replacement and System Test

The root cause turned out to be two failed boards: the defrost control board (with its sensor) and the main blower control board. Once the replacement parts arrived, our HEP technician:

• Removed the old circuit boards.
• Installed the new defrost board and blower control board.
• Discovered a faulty low-pressure safety switch, which was also replaced.
• Recharged the refrigerant to optimal levels.
• Ran the system through multiple cooling cycles to confirm smooth operation.

A fresh control board helps your system run reliably and safely.

By the end of the visit, the heat pump was cooling properly, the blower was running on command, and the homeowner could enjoy cool air again.

Tips for Homeowners

• Schedule Annual Check-Ups: A yearly tune-up catches low refrigerant, failing controls, and worn-out switches before they leave you without cool air.
• Clear the Area Around Your Unit: Good airflow helps your system operate efficiently and gives technicians easy access.
• Watch for Warning Signs: Strange noises, uneven airflow, or higher energy bills often point to early issues.
• Invest in Professional Tools: Technicians using proper gauges and meters get accurate readings that save you time and money in the long run.

Conclusion

Dealing with a cooling breakdown can be stressful, especially in Knoxville’s summer heat. Our HEP technician’s thorough approach—from detailed diagnostics to careful part replacement—ensures your home stays comfortable. If you experience any HVAC hiccups, don’t wait. Early intervention by a qualified professional is the key to lasting comfort and peace of mind.