HVAC Components We Repair & Replace, Georgetown TX
Motors & Fans
Diagnose and repair indoor blower motor failures, bearing wear, winding failure, and capacitor issues.
Replace failed indoor blower motors, we stock common motors for Carrier, Trane, Lennox, Goodman, and Rheem.
Lubricate blower motor bearings before they fail, catches motors that squeal before they burn out.
Clean blower wheels coated with dust and debris that reduce airflow and strain the motor.
Repair or replace condenser fan motors, outdoor fan failure causes compressor overheating on Georgetown's 100°F days.
Diagnose and repair outdoor condenser fan motor failures, common cause of AC shutdown in peak summer heat.
Replace cracked, bent, or imbalanced outdoor fan blades causing vibration and motor strain.
Capacitors & Contactors
The #1 Georgetown summer repair. Capacitors overheat and fail in sustained 100°F+ heat, fast, affordable fix.
Test capacitors before replacing, an out-of-spec capacitor causes the same symptoms as a failed compressor.
Replace failed run capacitors on compressors and fan motors, the most common summer AC component failure.
Replace start capacitors that provide the extra torque needed to start compressors on hot days.
Install hard start kits on aging compressors to reduce starting current and extend compressor life.
Replace pitted or failed contactors, the relay that connects power to the compressor and condenser fan.
Replace AC contactors with pitted contacts that cause intermittent power to compressor and outdoor fan.
Compressor Service
Diagnose compressor failures, not every compressor problem requires replacement. We test before recommending replacement.
Compressor replacement with full circuit flush, filter drier, evacuation, and recharge, done correctly to protect the new compressor.
Replace discharge mufflers that reduce compressor noise and protect the refrigerant circuit.
Install crankcase heaters to prevent refrigerant migration into compressor oil during cold Texas nights.
Replace failed high-pressure safety switches that protect compressors from dangerously high discharge pressure.
Replace low-pressure safety switches that prevent compressor damage from loss of refrigerant charge.
Furnace Components
Replace failed high-limit switches that shut furnaces down on overheating, essential safety component.
Replace faulty furnace control boards, we test all connected components first to confirm the board is the failure.
Repair or replace fan control switches that govern blower timing in older furnaces without electronic control boards.
Replace fragile silicon carbide or silicon nitride ignitors, the #1 furnace no-heat repair in Georgetown.
Replace or clean flame sensors that fail to detect the burner flame, causing furnace lockout.
Replace failed gas valves that prevent gas flow to burners, verified diagnosis before replacement.
Replace thermocouples on older standing pilot furnaces that fail to keep the pilot lit.
Replace tripped rollout switches, but also diagnose why flames rolled out, as this indicates a serious underlying condition.
Replace failed draft inducer motors in 80%+ efficiency furnaces, failure causes pressure switch trips and no-heat conditions.
Replace failed heating elements in electric furnaces, test all elements and sequencers before partial replacement.
Replace failed sequencers that stagger heating element startup to prevent circuit overload.
Replace cracked or blocked pilot tubing on older standing pilot furnaces and boilers.
Repair standing pilot assembly issues on older furnaces, thermocouple, pilot orifice, and gas valve.
Replace corroded or leaking main gas shutoff valves at HVAC equipment.
Outdoor Unit & Noise Components
Install compressor sound blankets to reduce outdoor unit noise, particularly useful in Georgetown's zero-lot-line neighborhoods.
Replace deteriorated equipment pads and isolation mounts that transmit vibration through slabs and walls.
The Mechanical Switch Older Furnaces Still Rely On
Before electronic control boards became standard, furnaces used a mechanical device called a fan control switch, sometimes called a fan limit switch, to determine when the blower motor turns on and off relative to the heat exchanger's temperature. This bimetal-based switch is mounted on or near the plenum and physically bends in response to heat, closing a set of contacts to start the blower once the plenum reaches a preset fan-on temperature, and opening those contacts to stop the blower once temperature drops below a fan-off setting after the burners shut down.
Some fan control switches are combination units that also include a high-limit safety function in the same housing, adding a third temperature threshold that shuts down the burners entirely if plenum temperature climbs dangerously high, while other installations use a separate dedicated high-limit switch alongside the fan control. Understanding which configuration a given furnace uses matters for correctly diagnosing which specific temperature threshold is misbehaving.
Over years of thermal cycling, the bimetal element in these switches can drift out of its factory calibration, causing symptoms like a noticeable delay before warm air starts flowing after the burners ignite, cold air blowing briefly at the start of a cycle, or a blower that runs excessively long after the thermostat is satisfied because the fan-off temperature setting has drifted too low. In some cases the switch's contacts themselves become worn or pitted from the same repeated arcing that affects any electromechanical switch, causing intermittent blower operation independent of actual temperature.
Diagnosis involves verifying actual plenum temperature with a separate thermometer at the point the switch should be triggering, and comparing that reading against the switch's stamped settings, if the switch is triggering meaningfully off from its rated setpoints, it needs adjustment if adjustable, or replacement if the drift is beyond correction. This repair comes up most often on furnaces from before the widespread adoption of electronic ignition control boards, which are less common in Georgetown's newer subdivisions but still present in a fair number of the area's older homes and long-standing neighborhoods.
Frequently Asked Questions, Furnace Fan Control Switch Repair
Need a Component Diagnosed or Replaced?
We test before we replace. Most parts are on the truck for same-day service.