Thermostat & Controls Services, Georgetown TX
Thermostat Installation & Service
Install any thermostat, standard, programmable, or smart, with proper wiring, configuration, and testing.
Replace faulty or outdated thermostats. We identify compatibility requirements before recommending equipment.
Recalibrate thermostats reading inaccurately, a 2-3°F offset causes significant comfort and efficiency problems in Georgetown's heat.
Determine if the thermostat or the system is the cause of HVAC problems, the thermostat is rarely the actual culprit.
Relocate thermostats away from heat sources, drafts, or direct sunlight that cause inaccurate temperature readings.
Install a common wire for smart thermostats that require continuous 24V power, without it, smart thermostats often malfunction.
Full smart thermostat setup including wiring, app configuration, scheduling, and compatibility verification.
Optimize thermostat response settings, anticipator adjustment, and stage sequencing for your specific system.
HVAC Electrical Diagnostics & Repair
Systematic low-voltage and line-voltage electrical diagnosis, find faults without replacing working components.
Repair damaged, corroded, or incorrectly wired HVAC control and power circuits.
Diagnose and repair HVAC power supply issues, breakers, disconnects, and line-voltage components.
Correct overcurrent or undersized circuit conditions causing tripped breakers or component damage.
Recover HVAC systems stuck in lockout, error states, or post-power-surge conditions.
Trace and repair 24V control circuit faults, shorts, opens, and incorrect wiring between thermostat and equipment.
Repair or replace outdoor AC disconnect boxes, fuses, and weatherhead connections.
Replace deteriorated flexible conduit and wiring connections at outdoor AC units.
HVAC Control Components
Diagnose and repair HVAC control system failures including boards, relays, and communication wiring.
Full system calibration, thermostat, controls, and equipment operating parameters aligned and verified.
Calibrate system staging, fan delays, and operating behavior for your specific comfort and efficiency goals.
Calibrate control signals between thermostat and equipment, staging, modulation, and communication signals.
Replace failed 24V control transformers, the power supply for the entire low-voltage control circuit.
Replace failed relay boards that control equipment staging and multi-zone operation.
Install safety disconnect switches for code compliance and service safety on HVAC equipment.
Replace aquastat controls on hydronic and boiler systems that regulate water temperature.
Install and configure zone control panels for multi-zone HVAC systems.
Install outdoor temperature sensors for weather-compensating controls and smart thermostat systems.
Repairing Control Boards, Relays, and Communication Faults
The control board is the central decision maker in a modern HVAC system, reading inputs from the thermostat, limit switches, and safety devices, then energizing the relays and outputs that actually run the blower, ignitor, inducer motor, and compressor contactor in the correct sequence. When a control board fails or a relay on it sticks or burns out, the symptoms can look like almost any other HVAC problem, a system that won't start, one that starts but shuts off quickly, or one that runs the wrong component at the wrong time, which is why control system diagnosis requires ruling out simpler causes before condemning the board itself.
Relay failures are actually more common than full board failures. Relays are electromechanical switches with physical contacts that wear from repeated cycling, and after years of daily cycling those contacts can pit, weld shut, or fail to close reliably. A welded relay contact keeps a component running even when the board tries to shut it off, while a contact that won't close prevents that component from ever getting power. We test relays under actual load rather than just visually inspecting them, since a relay can look fine and still fail intermittently under the current draw of a real motor or compressor.
Communication faults are a newer category of control system problem specific to communicating equipment, where the indoor and outdoor units and the thermostat all exchange data over a shared bus wire rather than simple dedicated conductors. A single bad connection, a nicked wire, or even electrical noise from a nearby source can disrupt this communication and cause the system to fault out entirely or fall back to a limited emergency operating mode. Diagnosing these requires checking communication voltage and signal integrity at each device on the bus, not just verifying power is present.
Our repair process always starts with pulling stored fault codes from the board, since most modern boards log diagnostic codes even after a fault clears, giving us a starting point rather than a blind rebuild. We then verify actual component function under load, confirm safety switch states, and check for the kind of intermittent connection issues, corroded plug connectors, loose ribbon cables, rodent damage, that are common in Georgetown attics where boards mounted in air handlers see wide temperature swings between conditioned space and unconditioned attic access panels. A board replacement is always our last step, not our first assumption.
Frequently Asked Questions, HVAC Control System Repair
HVAC Electrical or Thermostat Issue?
We trace faults to the actual source, not replace parts until something works.