Every control board repair starts with a full electrical diagnostic, not a parts swap. We test the whole circuit so the new board is not killed by the same fault. Here is what is covered in a standard visit, and what we quote separately if we find it.
We test incoming line voltage, transformer output, capacitor microfarads, contactor coil resistance, and thermostat signals. This 30-to-45-minute process identifies the actual failed component instead of guessing at the board.
We install a manufacturer-matched board for your Carrier, Trane, Lennox, Mitsubishi Electric, Daikin, Bosch, Goodman, Rheem, American Standard, or Bryant unit. Aftermarket boards are a last resort, not our default.
These two parts fail more often than boards and often cause the board failure. We test both and replace them when readings are out of spec, so the new board is not stressed by a weak component.
Rodent damage, loose spade connectors, and corroded wire nuts are common in older McLean homes. We repair or replace damaged low-voltage wiring and label every conductor before we reconnect the new board.
A thermostat sending bad signals can mimic a board failure. We verify thermostat output and calibration, and replace it if it is the actual source of the problem.
After the repair, we run a complete heating and cooling cycle, verify the reversing valve shifts, and confirm defrost board timing. You get a written summary of what failed and what we replaced.
Heat Pump Electrical and Control Board Repair McLean VA is the diagnostic and repair service that traces power from the breaker through the contactor, capacitor, transformer, and control board to find why a heat pump will not start, will not switch modes, or keeps tripping. The control board is the brain of the system. It reads the thermostat, opens the reversing valve, starts the blower motor, and runs the defrost cycle. When a relay solder joint cracks or a capacitor fails, the whole system goes quiet.
McLean homes run heat pumps hard through humid summers and cold snaps that push defrost cycles to the limit. In older Chesterbrook and Franklin Park houses, we often find control board failure caused by voltage spikes, pest damage, or a failing contactor that cooked the board. If you are searching for HVAC heat pump electrical repair McLean Virginia or a team that can fix a heat pump electrical issue near me McLean, we stock boards for Carrier, Trane, Lennox, Mitsubishi Electric, and Daikin so most jobs finish in one visit.
You get a clear sequence from the first phone call to the final system test. No mystery, no surprise charges, no tech who disappears for an hour.
Schedule
Call or book online — a real human picks up and confirms a 2-hour arrival window.
Diagnose
Licensed tech inspects on-site, then walks you through the cause and your options.
Fix
The job is completed to code and done right the first time — no shortcuts, no surprises.
Guarantee
Every job backed by a written workmanship warranty — and we stand behind it.
Fluke Multimeter
Measures line voltage, transformer output, and control board signal voltage. It is the first tool we reach for on any electrical fault.
Clamp Meter
Reads amp draw on the compressor, fan motor, and blower motor to confirm they are within nameplate ratings after a board replacement.
Manifold Gauge Set
Checks refrigerant pressures when an electrical fault may have caused a compressor or reversing valve problem.
Capacitor Tester
Reads microfarads on run and start capacitors. A capacitor that is 10 percent out of spec gets replaced before it kills the new board.
Electronic Leak Detector
Finds refrigerant leaks that can trip pressure safeties and make a control board look faulty.
Thermostat Calibration Tool
Verifies thermostat output and calibration so we do not replace a board when the thermostat is the real problem.
Vacuum Pump and Recovery Machine
Used when a repair requires opening the refrigerant circuit, such as a reversing valve replacement.
NATE-certified diagnostic protocol
Our technicians follow a NATE-standard sequence: verify power, test the transformer, check the board, then test every load the board controls. This order prevents misdiagnosis and ensures the replacement board is not installed into a circuit with another fault.
EPA Section 608 refrigerant handling
Any repair that opens the sealed system follows EPA Section 608 rules for recovery, evacuation, and recharge. We use R-410A and R-32 refrigerant according to the manufacturer's specification for your unit.
Virginia HVAC contractor license compliance
Every electrical repair meets Virginia HVAC contractor license requirements and Fairfax County permit rules where they apply. We verify grounding, breaker sizing, and low-voltage wiring before we close up.
AHRI-matched parts sourcing
We source control boards and electrical components that meet AHRI certification standards for your system. That protects efficiency ratings and keeps your warranty intact.
01
What we do: We treat no-heat calls as priority. A technician arrives with boards and capacitors on the truck, diagnoses the fault, and repairs it the same night when the part is in stock.
→ Heat restored the same evening, usually within 2 to 4 hours of your call.
02
What we do: That pattern usually points to a failed transformer or control board. We test the transformer output first, then the board. If the board is dead, we replace it with an OEM part.
→ Thermostat power restored and the system running through a full cycle before we leave.
03
What we do: We check the board, thermostat calibration, and refrigerant charge. A board with a faulty sensor circuit can make the system run forever without satisfying the thermostat.
→ System cycles normally again, and your electric bill stops climbing.
04
What we do: We diagnose the reversing valve and board output, repair the fault, and provide a written summary you can hand to the buyer's agent.
→ A working heat pump and documentation that keeps the sale on track.
05
What we do: Surges often take out the control board and the capacitor together. We test both, replace what failed, and check the rest of the low-voltage circuit for damage.
→ System restored, with a recommendation for surge protection to prevent a repeat.
McLean sits in Fairfax County, where summers are humid and winters swing between mild and sharply cold. That swing is hard on heat pumps. Defrost cycles run more often in January and February, and each cycle puts wear on the defrost control board and reversing valve. In older neighborhoods like Salona Village and Kings Manor, many homes still have original 1990s panels and wiring that were not designed for the electrical load of a modern variable-speed heat pump. We see voltage drop at the disconnect, undersized breakers, and corroded low-voltage connections that cause intermittent board failures. Newer builds in West McLean and The Reserve often have surge-sensitive inverter boards that fail after a storm. When you call for HVAC heat pump electrical repair McLean Virginia, we ask about the age of your panel and any recent storms before we arrive, because that shapes what we bring on the truck. If you need heat pump control board replacement McLean VA near me, we confirm stock for your model before we dispatch.
Chesterbrook
Many homes here have original 1990s heat pumps with boards that are now failing from age and heat cycling. We stock compatible replacements.
West McLean
Newer construction with inverter-driven systems that are sensitive to power surges. We recommend surge protection with every board replacement here.
Salona Village
Older electrical panels and wiring often cause voltage drop that stresses control boards. We check panel capacity during every diagnostic.
Langley Forest
Larger homes with multi-zone systems where one failed board can shut down heating or cooling for an entire wing.
Franklin Park
Tree-heavy lots mean more pest intrusion into outdoor unit wiring, a common cause of control board failure we see here.
Humid summers that push long cooling cycles
Long run times heat up the control board and contactor. We check for heat damage and pitting on every summer repair call.
Cold snaps that trigger frequent defrost cycles
Each defrost cycle wears the defrost control board and reversing valve. We test both when a McLean homeowner reports cold air in heat mode.
Older homes with original electrical panels
Voltage drop and undersized breakers stress control boards. We verify panel capacity before installing a replacement board.
Summer storm power surges
Surges take out boards and capacitors together. We test both and recommend surge protection after every storm-related repair.
Most control board failures do not happen in isolation. Something else failed first and took the board with it. We find both problems and fix them together.
Problem
No heat in winter or no cooling in summer, and the thermostat may be blank or showing a fault code. Every hour without repair means a colder or hotter house.
Our Fix
We test line voltage, transformer output, and board relay operation to find where the circuit breaks. Most no-start calls trace to a failed board, a tripped internal breaker, or a bad contactor. We replace the failed part and verify the full circuit.
Problem
Short cycling drives up electric bills, wears out the compressor, and leaves rooms uncomfortable. It often points to a board that is misreading a sensor or a thermostat losing signal.
Our Fix
We check board sensor inputs, thermostat wiring, and refrigerant pressures. A board with a failing sensor circuit gets replaced. If the thermostat is dropping signal, we replace that instead and save you the board cost.
Problem
The system runs but does not heat, which usually means the reversing valve is not shifting. That valve needs a clean signal from the control board to change modes.
Our Fix
We test the board output to the reversing valve solenoid and check the valve itself. If the board is not sending voltage, we replace the board. If the valve is stuck, we repair or replace it and re-test the electrical circuit.
Problem
A humming outdoor unit with a still fan usually means a failed capacitor or a board that is not energizing the fan motor. Running it this way can overheat the compressor.
Our Fix
We test capacitor microfarads and fan motor windings, then check the board output. Most of these calls are a capacitor and a board relay. We replace both and confirm the fan starts smoothly before we leave.
Problem
A tripping breaker is an electrical fault that can damage the compressor or start a fire if ignored. It needs same-day attention, not a reset-and-hope approach.
Our Fix
We isolate the fault by testing the contactor, compressor windings, and board for shorts. A pitted contactor or a grounded compressor winding is the usual cause. We repair the fault and verify amp draw against the nameplate rating.
A dead control board leaves you without heat or cooling, and guesswork costs money. We test every circuit before we quote, so you pay for the fix that actually solves the problem.
Same-Day Board Swaps
We carry OEM boards for Carrier, Trane, Goodman, Rheem, and Bryant on the truck. That means heat pump control board replacement McLean VA often finishes in a single visit, usually within 2 to 4 hours of arrival. No waiting a week for a part order while your house bakes or freezes.
Real Electrical Testing
We use a Fluke multimeter and clamp meter to check incoming voltage, capacitor microfarads, and contactor coil resistance before condemning a board. A control board failure diagnosis that skips these steps is a guess. Ours is not, and that saves you from paying twice.
Code-Correct Repairs
Every repair meets Virginia HVAC contractor license standards and Fairfax County permit requirements where they apply. We verify low-voltage wiring, ground continuity, and breaker sizing so the new board is not stressed by the same fault that killed the old one.
1-Year Parts Warranty
Boards and electrical components we install carry a 1-year parts warranty. If the replacement board fails inside that window, we come back and make it right. That is the difference between a repair and a patch.
Control board repair pricing depends on the board type, the brand, and what else failed alongside it. Typical 2026 pricing in McLean runs $180 to $450 for capacitor or contactor repairs and $450 to $950 for heat pump control board replacement McLean VA. Inverter boards for Mitsubishi Electric and Daikin systems sit at the higher end because the parts cost more. Diagnostic fees run $89 to $129 and are credited toward the repair. We quote a flat price before we start, so you know the number before we pick up a tool.
Typical Investment Range
$180 - $950 depending on scope
A control board replacement costs a fraction of a new heat pump. Fixing the board and the part that killed it keeps your system running for years, and our 1-year parts warranty means the repair is covered if anything fails.
What changes the price
Board type and brand
Standard single-stage boards cost less than inverter or variable-speed boards. Carrier, Trane, and Lennox boards are widely stocked. Mitsubishi Electric and Daikin inverter boards cost more and may need same-day sourcing.
Failed companion parts
A failed capacitor or contactor often causes the board failure. Replacing both adds $80 to $200 to the job, but it prevents the new board from failing the same way.
Wiring condition
Rodent damage, corrosion, or loose connections add labor time. In older McLean homes, we often spend an extra 30 to 45 minutes repairing low-voltage wiring before installing the new board.
Access and location
Rooftop units, tight closets, and units behind finished walls take longer to access. We tell you upfront if access will affect the price.
Emergency timing
After-hours and weekend calls carry a higher dispatch rate. We tell you the rate before we roll a truck, so there is no surprise on the invoice.
Google ★★★★★4.9
Fast, honest, and they knew exactly what was wrong with our control board. The tech tested everything before quoting and had the part on his truck. Heat was back the same day.
Yelp ★★★★★4.8
They diagnosed a board failure that two other companies missed. Showed us the test readings and explained why the capacitor had killed the board. Fair price and no upsell.
BBB ★★★★★5.0
Professional from the first call. Arrived on time, wore boot covers, and cleaned up. Our heat pump has run perfectly since the control board replacement.
Google ★★★★★4.9
Called on a Sunday with no heat. They came out, replaced the board and contactor, and had us warm by evening. The price matched the quote exactly.
Our technicians hold NATE certification and EPA Section 608 certification, and we work under a Virginia HVAC contractor license. We have diagnosed control board failures on every major brand, from 1990s Bryant units in Salona Village to new Bosch inverter systems in West McLean. We know the difference between a board that failed on its own and one that was killed by a failing capacitor, a stuck contactor, or a thermostat sending bad signals. That distinction is what keeps the new board alive.
Real experiences from customers who chose our Heat Pump Electrical and Control Board Repair services.
“Our heat pump died on the first cold night of October. The tech tested the capacitor, found it had cooked the control board, and replaced both the same evening. He had the Carrier board on his truck. We had heat back by 9 p.m. and the price matched the quote exactly.”
David R.
Homeowner, Chesterbrook
“We called three companies about our Trane heat pump blowing cold air in heat mode. Two wanted to replace the reversing valve. McLean Heat Pump Pro Masters tested the defrost control board first and found the actual problem. Saved us over a thousand dollars and fixed it in one visit.”
Priya S.
Homeowner, West McLean
“Our 1990s Bryant unit kept tripping the breaker. They traced it to a failing contactor that was arcing and damaging the board. Replaced both, cleaned up the wiring, and showed us the old parts. Honest work, fair price, and they cleaned up after themselves.”
Tom and Ellen M.
Homeowners, Salona Village
Real answers to the questions we hear most often from local homeowners and property managers.
When a control board fails, it often takes a capacitor or contactor with it. Our heat pump repair service covers the full electrical and mechanical system so one visit fixes the root cause.
View Heat Pump RepairNew heat pump installs in McLean include a fresh control board, matched thermostat, and clean low-voltage wiring. We size the electrical components to your home so the board is not overloaded from day one.
View Heat Pump InstallationAnnual maintenance checks capacitor microfarads, contactor pitting, and board connections before they fail. It is the cheapest way to avoid a mid-winter control board replacement in McLean.
View Heat Pump MaintenanceNo heat at 2 a.m. or no cooling during a July heat wave is an emergency. We prioritize electrical and control board failures because a dead board means a dead system.
View Emergency Heat Pump RepairA heat pump that runs but blows cold air often has a failed reversing valve or a board that is not signaling the valve to shift. We test both before replacing parts.
View Heat Pump Not HeatingWhen cooling stops but the indoor fan runs, the control board may not be energizing the outdoor unit. We trace the signal from thermostat to board to contactor.
View Heat Pump Not CoolingCall us any time at (571) 760-4593 for heat pump repair in McLean, Virginia. We answer live 24/7, book same-day appointments, and dispatch emergency calls across Fairfax County. You can also email info@mcleanheatpumppromasters.com or stop by the shop during regular hours.
Phone
(571) 760-4593Address
7321 Hooking Rd, McLean, VA 22101
Hours
Mon–Fri: 7AM – 7PM
Sat: 8AM – 4PM
Sun: Emergency Only
24/7 Emergency Available
