Heat Pump Services We Offer in Georgetown TX
All heat pump repairs, reversing valve, defrost board, auxiliary heat, refrigerant circuit, and electrical components.
Systematic diagnosis of heat pump issues including heating mode failures, cooling failures, and abnormal operation.
Bi-annual heat pump tune-up, coil cleaning, refrigerant check, electrical testing, and defrost system verification.
Performance evaluation and optimization for heat pump systems running inefficiently or failing to reach setpoint.
Balance airflow distribution from heat pump systems for consistent comfort throughout the home.
The reversing valve switches the system between heating and cooling mode. Failure causes it to lock in one mode, we test and replace as needed.
Defrost board failure causes ice accumulation on the outdoor coil, we replace faulty boards and verify defrost cycles.
Prevent ice accumulation in the outdoor unit base pan during Georgetown freeze events.
Elevate the outdoor unit to prevent flooding and ice coverage during rare Georgetown ice storms.
Aux heat strips provide backup heating below the heat pump's efficiency range, we repair auxiliary heat controls and sequencers.
Heat pump stuck in defrost, defrosting too frequently, or not defrosting enough, we calibrate or repair the defrost system.
Same-day emergency heat pump service during Georgetown cold snaps and summer peak cooling periods.
What Causes a Defrost Board to Fail
The defrost control board reads the outdoor coil temperature sensor along with compressor run time, or on demand-defrost systems the actual differential between coil and ambient temperature, to decide when to briefly reverse the refrigerant cycle and melt frost off the outdoor coil. When the board or its sensor fails, the consequences show up quickly because the coil has no other way to clear ice.
The most common failure is the coil temperature sensor itself corroding or drifting out of calibration. If it reports a falsely warm reading, the board concludes the coil does not need defrosting and skips cycles it should be running, letting ice build up unchecked. If it reports a falsely cold reading, the opposite happens, the board initiates unnecessary defrost cycles every few minutes, which wastes energy, blows cooler air more often than it should, and puts extra wear on the reversing valve solenoid from constant cycling. The board itself can also fail outright from moisture intrusion into the control compartment or from a power surge, which is common after storms, and we frequently find scorched relay contacts or corrosion on the board's connector pins as the root cause.
Diagnosing a suspected board failure means checking voltage inputs and outputs at the board with a multimeter, testing the coil sensor's resistance against the manufacturer's temperature versus resistance chart at the actual outdoor temperature, and inspecting the board visually for burn marks or corrosion before assuming the board is bad rather than a wiring or sensor issue. If the board is confirmed faulty, we replace it with the OEM equivalent for that model, since defrost timing and termination logic vary between manufacturers and an incompatible board will not defrost correctly even if it powers on.
Board life in Georgetown is shortened by two local factors working together: sudden voltage fluctuations during winter storms when the grid is under strain, and, for air handlers or control compartments mounted in the attic, sustained high summer attic temperatures that accelerate component aging year-round. Homes with original equipment from the 2005 to 2012 construction period are now reaching the age where board failure becomes one of the more common heat pump service calls we see.
Frequently Asked Questions About Defrost Board Replacement
Heat Pump Not Working?
We service all heat pump brands and carry common parts on every truck.