A homeowner in Blanco called when her HVAC system stopped heating the home. The thermostat was blank, and the furnace would not turn on. Our 72 Degrees HVAC Service team responded, inspected the attic system, and found melted high-voltage wiring inside the air handler and disconnect box. We repaired the damaged wiring, added whole-system surge protection, and safely restored heat to the home the same day.
Job Overview
- Location: Blanco, TX
- Client Type: Residential
- Scope: Diagnose non-heating furnace, repair melted high-voltage wiring, restore system operation, install surge protection
- Equipment Installed: Whole-system surge protection device (HVAC system surge protector)
- Additional Work (if any): High-voltage wiring repair, disconnect box repairs, full system testing
- Why It Mattered: The home had no heat, and electrical damage could have led to further system failure or safety risks if left unaddressed.
What We Found
When we arrived, the thermostat screen was completely blank and the system was not running. After inspecting the attic air handler, we found that the high-voltage wiring inside the unit had melted. The disconnect box near the air handler also showed signs of heat damage.
No breakers had tripped, which suggested that a power surge likely caused an over-amp condition. That surge pushed more electricity through the wiring than it was designed to handle, leading to melted insulation and damaged connections. Without repair, the furnace would not operate and the wiring posed a potential safety concern.
The Solution
We explained the findings to the homeowner and reviewed the repair options. With approval, we replaced the damaged high-voltage wiring and repaired the disconnect components. To help prevent future damage, we installed whole-system surge protection for the HVAC equipment.
After completing the electrical repairs, we carefully reconnected all wiring, secured the connections, and restored power. We then tested the furnace through a full heating cycle to confirm proper ignition, airflow, and temperature rise. The system started heating normally and ran safely before we left the home.
Photo Highlights
A power surge caused the high-voltage wiring inside the attic air handler to melt, preventing the furnace from turning on.
The disconnect box near the furnace showed heat damage from an electrical surge, requiring safe rewiring and repair.
After replacing the damaged wiring and securing all connections, the furnace was restored to safe working condition.
With repairs complete and surge protection added, the HVAC system at this Blanco log home is operating normally again.
The Results
The furnace is now operating safely and heating the home as designed. The homeowner also has added protection against future electrical surges that could damage expensive HVAC components. By addressing both the immediate problem and the root cause, we helped restore comfort and protect the system long term.
Reliable Furnace Repair in Blanco TX
When your furnace suddenly stops working, you need fast answers and safe repairs. At 72 Degrees Air Conditioning, Heating, and Plumbing, we provide professional furnace repair in Blanco and throughout the Texas Hill Country. From electrical issues to heating failures, our experienced team finds the problem and fixes it right the first time. If your system is not heating properly, schedule a quote with 72 Degrees and let us get your home back to normal.
