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Commercial Chiller Repair for NYC Buildings — Back Online Fast
When the plant goes down, the whole building feels it — rising space temps, alarming BAS points, and tenants on the phone. Com+ Mechanical diagnoses and repairs air-cooled and water-cooled chillers across the five boroughs and metro area, from compressor and oil-system faults to refrigerant leaks and control failures. We restore cooling, then tell you exactly why it failed so it doesn't happen again.
Common Chiller Failures We Repair
Chiller trips on low evaporator refrigerant temp / low pressure
Often a fouled or scaled condenser, low refrigerant charge from a slow leak, a failing metering device (EXV stuck partially closed), or restricted chilled-water flow. We separate a true charge problem from a heat-rejection or flow problem before adding any refrigerant — adding gas to a fouled machine just masks the fault and risks compressor damage.
Centrifugal compressor surging — periodic 'whoosh' and load swings
Surge happens when the compressor can't develop enough lift, typically from dirty condenser tubes raising head pressure, low water flow, low refrigerant charge, or a hunting inlet-guide-vane/VFD control. Repeated surging hammers thrust bearings. We correct the underlying lift problem and verify guide-vane and variable-speed control before damage compounds.
High condenser pressure / head-pressure lockout
On water-cooled machines, scaled or biofouled condenser tubes, non-condensables in the circuit, or cooling-tower/condenser-water flow loss. On air-cooled units, clogged coils, failed condenser fans, or recirculation. We measure condenser approach to quantify fouling, purge non-condensables, and restore heat rejection rather than just resetting the trip.
Loss of oil pressure / oil-system fault
A drop in oil pressure differential or repeated oil-fault trips can stem from a failing oil pump, clogged oil filter, low oil heater (refrigerant flooding the oil), or refrigerant migration on shutdown. Running a compressor with poor lubrication is how a recoverable fault becomes a destroyed bearing or gearbox. We diagnose the oil circuit and pull oil analysis to read internal wear.
Refrigerant leak — losing charge, frequent top-offs
Common leak points are shaft seals on open-drive machines, rupture-disk and relief seats, tube-to-tubesheet joints, brazed connections, and Schrader/service valves. We locate leaks with electronic and ultrasonic detection, repair the source, then evacuate and recharge to spec. Chronic top-offs are both a reliability risk and a refrigerant-cost and compliance problem.
Compressor or chiller won't start — starter/VFD fault
Failed contactors, solid-state starter SCR faults, VFD DC-bus or IGBT failures, blown control fuses, tripped safeties (low oil, high pressure, flow), or motor insulation breakdown. We test the motor (megohm/winding resistance), inspect the starter or drive, and trace the safety string so we fix the actual cause instead of jumpering a protection device.
Chiller Down? We Diagnose the Real Fault, Not Just the Alarm Code
A tripped chiller rarely tells you the truth on the front panel. A "low evaporator refrigerant temperature" lockout can mean a fouled condenser, a failing oil pump, a stuck inlet guide vane, or a slow refrigerant leak — and each demands a completely different repair. Our technicians work the actual chiller plant: centrifugal, screw, and scroll machines from Trane, Carrier, York/Johnson Controls, Daikin, and Multistack. We read the refrigerant circuit the way it behaves — approach temperatures, superheat and subcooling, oil pressure differential, motor winding and bearing condition, and starter or VFD health — to isolate root cause before we touch a component. For a downed machine that's affecting occupied space, we prioritize getting safe, reliable cooling back online, then scope any permanent repair (tube work, compressor overhaul, controls replacement) with full transparency. Whether you run a single rooftop air-cooled unit on a commercial building or a multi-chiller water-cooled plant feeding a high-rise, we have the instrumentation, recovery equipment, and EPA-certified refrigerant handling to do it right.
What a Chiller Repair Call Includes
Why Buildings Call Com+ for Chiller Repair
Our Simple Process
From call to comfort in 4 easy steps
Rapid Response & Triage
We get a technician to your plant and assess severity immediately — is the building losing cooling now, or is the machine limping? We capture active alarms, recent fault history, and current operating conditions before anything is reset.
Root-Cause Diagnosis
We read the refrigerant circuit and electrical system the way the machine actually behaves — approach temperatures, superheat/subcooling, oil pressure, motor and bearing condition, starter/VFD health — to isolate the true fault, not just the symptom that tripped it.
Scoped Repair & Approval
You get a clear explanation of what failed, what it takes to fix it permanently, and your options — temporary restoration to regain cooling versus full repair. Pricing is scoped to the actual work and approved before we proceed.
Repair, Verify & Hand Off
We complete the repair, leak-check and evacuate as required, then run-test the machine through staging and unloading. We log the full operating envelope, confirm clean BAS communication, and give you a documented account of cause and corrective action.
Types of Systems We Install
Water-Cooled Centrifugal Chillers
The workhorse of large NYC central plants — high-capacity machines using a centrifugal compressor and shell-and-tube condenser rejecting heat to a cooling tower. Highly efficient at full load but sensitive to lift, fouling, and oil/bearing health.
- •Surge and inlet-guide-vane / VFD diagnostics
- •Eddy-current-informed condenser and evaporator tube service
- •Oil pump, oil heater, and bearing condition analysis
- •Purge-unit service and non-condensable removal on low-pressure machines
Air-Cooled Screw & Scroll Chillers
Common on commercial rooftops and at grade where no cooling tower is practical — packaged machines rejecting heat through condenser coils and fans. Simpler water side, but exposed to ambient fouling, coil damage, and fan/electrical faults.
- •Condenser coil cleaning and fan/motor repair
- •Screw rotor and slide-valve (capacity-control) diagnostics
- •Scroll and reciprocating compressor electrical/mechanical testing
- •High-ambient head-pressure and refrigerant-charge optimization
Modular Water-Cooled Chillers
Multiple smaller chiller modules piped together (e.g., Multistack-style) to provide redundancy and staged capacity. A failed module shouldn't take the building down — but it does require module-level diagnosis and isolation.
- •Per-module fault isolation without dropping the plant
- •Brazed-plate / shell-and-tube heat exchanger inspection
- •Scroll compressor and module controller repair
- •Header, flow-switch, and staging-control troubleshooting
The Com+ Mechanical Difference
Commercial Chiller Specialists
We work central plants for a living — high-rises, hospitals, data centers, schools, and commercial portfolios across the NYC metro. This is not residential AC work scaled up; it's purpose-built chiller expertise.
We Protect Your Biggest Asset
A chiller compressor or tube bundle is a major capital item. Our diagnostics are built to catch oil, surge, and fouling problems before they cascade into a compressor replacement — saving you far more than the repair costs.
Portfolio-Ready Service
Manage multiple buildings? We support multi-site and multi-chiller portfolios with consistent technicians, documentation, and reporting, so every plant is handled the same way and nothing falls through the cracks.
Efficiency & Compliance Aware
Every repair is made with plant efficiency in mind. Clean condensers, correct charge, and properly tuned controls lower kW/ton — directly relevant to Local Law 97 emissions limits and your operating budget.
Transparent Pricing
No fees. No surprises. Just honest service.
Chiller Repair
Corrective repair of the diagnosed fault — from leak repair and controls to compressor, oil-system, and condenser work — to restore reliable cooling.
- Compressor, oil-system, expansion-device, and controls repair
- EPA-compliant leak repair, recovery, evacuation, and recharge
- Condenser tube cleaning (water-cooled) or coil/fan repair (air-cooled)
- Starter and VFD repair
- Post-repair run-test, performance log, and BAS handoff
Preventive Maintenance Agreement
Scheduled chiller maintenance to prevent failures, hold efficiency, and prioritize your plant for emergency response — for single sites or full portfolios.
- Scheduled inspections, oil and refrigerant analysis, and eddy-current tube testing intervals
- Condenser cleaning and operating-log trending to catch fouling and wear early
- Priority emergency-response scheduling for agreement plants
- Efficiency tracking (kW/ton) to support Local Law 97 planning
- Multi-building and multi-chiller portfolio coverage
All pricing is scoped after an on-site assessment — chiller type, refrigerant, fault severity, and parts drive the final number. We confirm the estimate before any repair begins.
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
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Frequently Asked Questions
Get answers to common questions about our services
My chiller is down and the building is getting warm — how fast can you respond?
We treat a downed chiller serving occupied space as an emergency and dispatch 24/7. The first goal is to get a qualified technician on site to triage severity and, where possible, restore safe cooling while we scope a permanent repair. Call (332) 600-4640 anytime.
Do you service both air-cooled and water-cooled chillers?
Yes. We repair air-cooled machines (rooftop and grade-mounted units with coil-and-fan heat rejection) and water-cooled machines (shell-and-tube condensers tied to a cooling tower), across centrifugal, screw, scroll, and reciprocating compressor types. Each platform fails differently and we diagnose accordingly.
Can you repair our chiller without replacing the whole machine?
Most faults — leaks, controls, expansion devices, oil-system components, starters/VFDs, condenser fouling, even many compressor issues — are repairable. Our diagnostics are specifically designed to catch problems early so a recoverable fault doesn't escalate into a compressor or tube-bundle replacement. If a component truly needs replacing, we'll show you the evidence and your options.
We manage several buildings with different chillers. Can you cover the whole portfolio?
Yes. We support multi-building and multi-chiller portfolios with consistent technicians, standardized documentation, and per-plant operating histories. A maintenance agreement keeps every machine on a schedule and gives your sites priority for emergency response — so you're not chasing a different vendor for each property.
How does chiller repair affect Local Law 97 and our energy costs?
A chiller running with fouled condensers, low charge, non-condensables, or hunting controls burns far more energy per ton of cooling. Because the chiller plant is typically the largest single electrical load in a commercial building, restoring it to spec directly lowers kW/ton — cutting operating cost and the building's carbon intensity under Local Law 97. We make repairs with efficiency in mind, not just to clear the alarm.
Do you handle the refrigerant properly, including newer low-GWP types?
Yes. All refrigerant work is performed by EPA-certified technicians with proper recovery, evacuation, and recharge procedures. We handle legacy and current refrigerants including R-134a, R-410A, and lower-GWP options such as R-513A, R-1233zd(E), and R-32, and we document recovered and added quantities.
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Chiller Down? Get a Specialist on the Line Now.
Every hour a chiller is offline means warmer occupied space, alarming BAS points, and tenant complaints — and the risk of a recoverable fault turning into a compressor failure. Com+ Mechanical delivers 24/7 emergency chiller repair across the NYC metro, with the diagnostics, refrigerant handling, and multi-platform expertise to get your plant back online and keep it there. Reach a chiller specialist now.
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