'%3e%3cpath%20d='M41.90,14.92%20L44.15,2.36%20L55.85,2.36%20L58.10,14.92%20A36%2036%200%200%201%2069.08,19.47%20L79.55,12.18%20L87.82,20.45%20L80.53,30.92%20A36%2036%200%200%201%2085.08,41.90%20L97.64,44.15%20L97.64,55.85%20L85.08,58.10%20A36%2036%200%200%201%2080.53,69.08%20L87.82,79.55%20L79.55,87.82%20L69.08,80.53%20A36%2036%200%200%201%2058.10,85.08%20L55.85,97.64%20L44.15,97.64%20L41.90,85.08%20A36%2036%200%200%201%2030.92,80.53%20L20.45,87.82%20L12.18,79.55%20L19.47,69.08%20A36%2036%200%200%201%2014.92,58.10%20L2.36,55.85%20L2.36,44.15%20L14.92,41.90%20A36%2036%200%200%201%2019.47,30.92%20L12.18,20.45%20L20.45,12.18%20L30.92,19.47%20A36%2036%200%200%201%2041.90,14.92%20Z'%20fill='url(%23cpGear)'%3e%3c/path%3e%3ccircle%20cx='50'%20cy='50'%20r='28'%20fill='none'%20stroke='%23012f00'%20stroke-width='3'%3e%3c/circle%3e%3cpath%20d='M43.50,37.50%20L45.50,35.50%20L54.50,35.50%20L56.50,37.50%20L56.50,43.50%20L62.50,43.50%20L64.50,45.50%20L64.50,54.50%20L62.50,56.50%20L56.50,56.50%20L56.50,62.50%20L54.50,64.50%20L45.50,64.50%20L43.50,62.50%20L43.50,56.50%20L37.50,56.50%20L35.50,54.50%20L35.50,45.50%20L37.50,43.50%20L43.50,43.50%20Z'%20fill='url(%23cpGold)'%20stroke='%23bf5d00'%20stroke-width='0.4'%20stroke-linejoin='miter'%3e%3c/path%3e%3c/g%3e%3c/svg%3e){kind=small}
Commercial VRF & VRV Repair Across the NYC Metro
When zones stop conditioning or your VRF system throws error codes, you need technicians who understand variable refrigerant flow architecture, not generic HVAC help. Com+ Mechanical diagnoses inverter, communication, and refrigerant faults on Daikin VRV, Mitsubishi City Multi, LG Multi V and other commercial systems. We get tenant floors comfortable again and your building back to full uptime.
Common VRF System Faults We Resolve
One zone or group of zones won't condition while others run fine
Often an electronic expansion valve stuck closed at the indoor unit, a failed indoor PCB, or a branch selector solenoid not opening to that circuit. We isolate the affected unit on the network rather than assuming a system-wide problem.
Outdoor unit displays a communication or transmission error code
Typically an F1/F2 bus fault: a broken or shorted transmission wire, reversed polarity, a duplicate unit address, or a failed communication chip on an indoor or outdoor PCB. We meter the bus and walk the network to find the break.
System short-cycles or the inverter compressor keeps tripping on fault
Points to inverter/IPM board failure, high-pressure or discharge-temperature lockout, refrigerant overcharge or undercharge, or a failing discharge thermistor feeding bad data to the controller. We verify pressures and electrical signatures before condemning the compressor.
Weak conditioning or long pull-down across multiple floors
Frequently low refrigerant charge from a slow line-set leak, oil logging in the coils, EEVs not modulating correctly, or a fouled outdoor heat exchanger. We run superheat/subcooling diagnostics to find the true cause instead of just topping off refrigerant.
Heat-recovery system can't simultaneously heat and cool zones
Usually a branch controller / branch selector box problem, stuck changeover solenoid valves, a liquid/gas line fault, or a control signal not reaching the BS unit. We test each port of the branch box and its actuators.
Repeated thermistor or sensor error codes with erratic temperatures
Thermistors drift out of spec with age and cause the controller to misjudge refrigerant or coil temperature, leading to surging, frost, or capacity loss. We measure sensor resistance against the manufacturer curve and replace the failed sensors.
Expert Diagnosis for Variable Refrigerant Flow Systems
VRF and VRV systems are the backbone of conditioning in many NYC commercial buildings, office floors, hospitality, mixed-use and multi-tenant properties, precisely because they zone independently and modulate capacity to occupancy. That same sophistication makes them unforgiving when something goes wrong: a single fault on the F1/F2 communication bus, a stuck electronic expansion valve, an inverter board failure, or refrigerant migration across long vertical line sets can take down an entire group of indoor units while the rest of the system reports normal. Com+ Mechanical specializes in commercial VRF repair for property managers and facility teams who can't afford floors of unhappy tenants. Our technicians read manufacturer error codes, interrogate system controllers, and trace faults to the actual component, condenser, branch selector, or fan-coil, rather than swapping parts and hoping. We service the five boroughs plus Nassau, Westchester, northern New Jersey and Stamford, CT, and we work around your occupancy and building access requirements.
What Our VRF Repair Service Covers
Why VRF Repair Is Different, and Why It Matters to Your Building
Our Simple Process
From call to comfort in 4 easy steps
Code Pull & System Interrogation
We pull active and stored fault codes at the outdoor unit and central controller, confirm which indoor units and branch circuits are affected, and review the system's operating data and history.
Component-Level Diagnosis
We meter the F1/F2 communication bus, test EEVs, thermistors, inverter boards and solenoids, and run superheat/subcooling and pressure analysis to pinpoint the failed component, not just the symptom.
Scoped Repair & Approval
We explain the root cause in plain terms, provide a clear scope and Custom Quote for parts and labor, and confirm access and timing with your team before proceeding.
Repair, Verification & Handoff
We complete the repair, recharge and verify refrigerant where applicable, confirm every affected zone is conditioning and clear of codes, and document the work for your records.
Types of Systems We Install
Heat Pump VRF (2-Pipe)
All indoor units on the system operate in the same mode, heating or cooling, at a given time. Common in spaces with uniform load profiles such as open office floors and retail.
- •Two-pipe refrigerant distribution
- •Inverter-driven condensing units
- •Simpler branch piping than heat recovery
Heat Recovery VRF (3-Pipe)
Allows simultaneous heating and cooling across different zones by moving recovered heat from rooms that need cooling to rooms that need heating, via branch selector boxes. Ideal for buildings with varied solar exposure and mixed occupancy.
- •Three-pipe (or BC/BS controller) architecture
- •Branch selector / branch controller boxes per zone group
- •Energy recovery between simultaneously heating and cooling zones
Water-Source VRF
Rejects or absorbs heat through a building water loop rather than air-cooled condensers, well suited to high-rise NYC properties where rooftop air-cooled space is limited or where a central loop already exists.
- •Water-cooled condensing modules tied to a building loop
- •Compact indoor mechanical-room footprint
- •Strong fit for high-rise and tower applications
Why Property Teams Choose Com+ Mechanical
VRF/VRV Specialists, Not Generalists
We work on variable refrigerant flow systems daily and understand inverter control, heat-recovery branch architecture and multi-unit communication networks at the level these systems demand.
24/7 Commercial Response
VRF faults don't wait for business hours. Our team responds around the clock so a comms fault or compressor lockout doesn't leave tenant floors without conditioning.
Portfolio-Ready Coverage
From a single building to a portfolio across the five boroughs, Nassau, Westchester, northern NJ and Stamford, we standardize service and reporting so your facilities team has one accountable VRF partner.
Honest, Documented Repairs
We diagnose to the component and give you straight answers on repair vs. eventual replacement, with documentation that supports your maintenance and capital-planning decisions.
Transparent Pricing
No fees. No surprises. Just honest service.
VRF System Repair
Component-level repair of the diagnosed fault to return all zones to full operation.
- Repair or replacement of failed component (EEV, thermistor, PCB, inverter board, solenoid, branch box parts)
- Refrigerant recovery, leak repair and charge verification where required
- Communication network correction and address/configuration fixes
- Post-repair verification that all zones condition and run code-free
- Documentation for your facilities records
VRF Maintenance Agreement
Scheduled preventive maintenance to reduce VRF failures and protect uptime across your building or portfolio.
- Recurring inspection of condensers, branch controllers and indoor units
- Refrigerant, subcooling/superheat and electrical health checks
- Sensor and EEV operation verification before they fail
- Priority scheduling and consolidated multi-building reporting
All VRF repair pricing is scoped after an on-site assessment, exact cost depends on the manufacturer, the failed component, refrigerant volume and building access.
Own a Commercial Property?
Business+ plans start at $499/year — includes 2 rtu tune-ups, 10% off all services, and priority scheduling.
Equipment & Brands We Service
Factory-trained technicians for all major HVAC manufacturers
%20--%3e%3csvg%20version='1.1'%20id='Layer_1'%20xmlns='http://www.w3.org/2000/svg'%20xmlns:xlink='http://www.w3.org/1999/xlink'%20x='0px'%20y='0px'%20viewBox='0%200%20150%2050'%20style='enable-background:new%200%200%20150%2050;'%20xml:space='preserve'%3e%3cg%3e%3cpath%20style='fill:%23C9202F;'%20d='M124.447,44.322c-23.807,5.229-55.19-0.102-55.19-0.102s73.175,3.979,71.344-20.254%20C138.687-1.368,35.312,8.163,35.312,8.163c60.192-10.521,91.646-0.564,93.939-0.144c11.942,3.18,19.694,9.036,20.404,15.459%20C151.563,35.271,135.269,41.943,124.447,44.322z'/%3e%3cpath%20style='fill:%23C9202F;'%20d='M83.171,38.6c-2.416,0-4.058-0.553-4.927-1.656s-1.022-2.773-0.301-5.027l4.168-12.728%20c0.861-2.684,1.97-4.478,3.324-5.382c1.353-0.904,3.469-1.357,6.35-1.357h2.956c2.877,0,4.145,0.301,5.231,1.535%20c0.934,1.06,0.972,2.521,0.108,5.205l-4.149,12.718c-0.723,2.254-1.507,4.117-3.085,5.223S88.903,38.6,86.488,38.6L83.171,38.6z%20M96.602,18.799c0.302-1.029,0.558-1.979,0.113-2.657c-0.327-0.502-0.804-0.66-1.711-0.731c-0.829-0.117-2.286-0.062-2.286-0.062%20c-1.258,0.037-2.021,0.267-2.65,0.772c-0.629,0.506-0.955,1.038-1.479,2.669L84.19,32.285c-0.406,1.26-0.455,2.143-0.151,2.65%20c0.302,0.506,1.244,0.822,2.747,0.822c1.418-0.004,2.752-0.059,3.935-0.955c0.682-0.43,1.019-1.258,1.459-2.508L96.602,18.799z'/%3e%3cpath%20style='fill:%23C9202F;'%20d='M14.834,38.18c0,0-14.646,0.014-14.643,0.002l8.314-25.357h6.201c0,0-7.508,22.517-7.448,22.517%20h8.521L14.834,38.18z'/%3e%3cpath%20style='fill:%23C9202F;'%20d='M39.008,15.701c-0.006,0,0.945-2.86,0.945-2.86H25.417c-0.002,0-0.005,0-0.005,0l-8.31,25.339H31.61%20l0.951-2.838c0,0-7.745,0-8.385,0c-0.027,0,1.516-4.672,3.201-9.758c3.337,0,7.298,0,7.294,0c-0.008,0,0.938-2.859,0.938-2.859%20s-3.821,0-7.282-0.001c0.876-2.64,1.72-5.18,2.333-7.023C34.597,15.701,39.013,15.701,39.008,15.701z'/%3e%3cpath%20style='fill:%23C9202F;'%20d='M77.25,12.821l-5.508,16.97l-2.311-16.967l-6.073,0.003l-8.253,25.356h6.074l5.537-16.979%20c0,0,2.265,16.725,2.305,16.971l-0.002,0.006l3.525,0.002l8.242-25.363L77.25,12.821L77.25,12.821z'/%3e%3cpath%20style='fill:%23C9202F;'%20d='M121.157,12.821h-4.427l-5.274,6.652l-1.309-6.652l-6.496,0.007l2.393,11.52l-10.54,13.836h4.357%20l7.112-9.356l1.94,9.352l6.226,0.002l-2.777-14.11L121.157,12.821z'/%3e%3cpath%20style='fill:%23C9202F;'%20d='M56.332,12.822l-5.511,16.971l-2.308-16.965l-6.075,0.003l-8.252,25.357h6.074l5.535-16.981%20c0,0,2.268,16.739,2.305,16.97l-0.002,0.012h3.527l8.241-25.365h-3.534L56.332,12.822z'/%3e%3cpath%20style='fill:%23C9202F;'%20d='M138.687,44.271c0,1.305-1.07,2.375-2.376,2.375c-1.305,0-2.373-1.07-2.373-2.375%20s1.068-2.373,2.373-2.373S138.687,42.967,138.687,44.271z%20M134.331,44.271c0,1.076,0.903,1.975,1.979,1.982%20c1.075-0.008,1.981-0.906,1.981-1.982c0-1.074-0.906-1.98-1.981-1.98C135.234,42.291,134.331,43.197,134.331,44.271z%20M135.688,42.98h1.022c0.559,0,0.768,0.295,0.768,0.57c0,0.533-0.334,0.695-0.616,0.834l0.42,1.08l-0.681,0.092l-0.317-1.041%20h-0.288l-0.211,1.004h-0.621L135.688,42.98z%20M136.095,44.135h0.223c0.321,0,0.524-0.189,0.524-0.48%20c0-0.156-0.124-0.295-0.327-0.295h-0.262L136.095,44.135z'/%3e%3c/g%3e%3c/svg%3e)
Don't see your brand? We service all major manufacturers! Call us to confirm.
Proudly Serving Nassau County
Fast, reliable service in your neighborhood
Frequently Asked Questions
Get answers to common questions about our services
My VRF system is showing an error code, can you diagnose it remotely?
We interpret manufacturer fault codes across all major commercial VRF platforms, but accurate diagnosis requires interrogating the system on site, the same code can stem from a wiring fault, a failed sensor, or a PCB issue. Call (332) 600-4640 with the code and we'll dispatch a technician who can confirm the true root cause at the unit and controller.
Do you offer 24/7 emergency VRF repair?
Yes. VRF faults like compressor lockouts and communication failures can knock out conditioning for entire floors, so we provide around-the-clock commercial response across the NYC metro.
Can you service VRF systems across multiple buildings in our portfolio?
Absolutely. We support property managers and owners with multi-building portfolios across the five boroughs, Nassau, Westchester, northern NJ and Stamford, standardizing diagnosis, repair and reporting so you have one accountable VRF partner instead of a different vendor per site.
How does VRF repair relate to Local Law 97 and building efficiency?
VRF systems are inherently efficient because they modulate to load and recover heat between zones, but a system limping along with a refrigerant leak, drifting sensors or EEVs that won't modulate burns far more energy and undercuts your Local Law 97 emissions position. Restoring a VRF system to spec protects both comfort and your efficiency profile.
One floor lost cooling but the rest of the building is fine, is the whole system failing?
Usually not. VRF zones independently, so a localized outage often traces to one indoor unit's expansion valve or PCB, or a branch selector serving that circuit. We isolate the affected units on the network and repair the specific fault rather than touching the healthy parts of the system.
Do you handle the refrigerant and provide documentation for our records?
Yes. Refrigerant is recovered, leak-checked and recharged by EPA-certified technicians, and we provide repair documentation suitable for your facilities and compliance records.
Love Our Service? Share Your Experience!
Manage a building we've serviced? A quick review helps other NYC property managers and building owners find us.
5 stars • 500+ reviews
Most Requested Services
Our businesses' top picks for heating, cooling & air quality
Explore Commercial HVAC Resources
Equipment services, industry expertise, NYC compliance, and the metro areas we cover.
Equipment, Repair & Maintenance
Industries We Serve
NYC Compliance & Energy Law
Service Areas
Get Your VRF System Back to Full Operation
Don't let a VRF fault leave tenant floors without conditioning or quietly drain your building's efficiency. Com+ Mechanical brings true variable refrigerant flow expertise to property managers, owners and facility teams across the NYC metro, with 24/7 response and component-level diagnosis that fixes the real problem the first time. Call (332) 600-4640 to dispatch a VRF technician.
Request VRF Service