Air Filters
Evaporator and Condenser Coils
Fan Blades and Motors
Condensate Drain Lines
Ductwork
Grilles and Registers
Refrigerant Lines
Outdoor & Indoor Units
Thermostat
Refrigerant Leaks
Compressor Issues
Fan Motor Problems
Thermostat Malfunctions
Blower Motor Issues
Capacitor Failures
Electrical Problems
Condenser Coil Problems
Evaporator Coil Issues
Expansion Valve Problems
Ductwork Issues
Heat Exchanger Problems
Water Leaks
Control Board Issues
Airflow Problems
Commercial refrigeration repair across Long Island
Commercial refrigeration repair starts with the box in front of you: what it is reading now, how long the product in it has been out of range, and what the repair is going to cost. We diagnose and fix walk-in coolers and freezers, reach-ins, prep tables, display cases and ice machines for restaurants, delis, grocery stores, warehouses and medical buildings across Suffolk and Nassau County.
Start with the symptom you can actually see
Pick what your equipment is doing. Each answer gives the likely causes in the order a technician rules them out, what gets checked first, and the page for that piece of equipment.
Not cooling, or holding warm
- Condenser coil fouled with grease, dust or lint, or its airflow blocked by stock, cardboard or a wall too close
- Condenser fan motor seized or running slow
- Refrigerant charge low from a leak
- Failed contactor, start capacitor or compressor overload, so the compressor is not actually running
- Evaporator iced over from a defrost fault
- Thermostat, controller or sensor reading wrong and never calling for cooling
- Compressor worn and no longer pumping to specification
Condenser airflow and head pressure, then whether the compressor is drawing current at all. Both take minutes and both clear several of the causes above.
Freezing product in a cooler
- Thermostat or controller out of calibration, so the box runs colder than the display claims
- Sensor or bulb out of position, touching a cold surface or sitting directly in the evaporator's return air
- Product stacked into the discharge airstream, so the closest cases freeze while the rest of the box is fine
- Fan delay or defrost setting wrong, so the evaporator fan keeps driving air over a cold coil after the compressor cuts out
- System oversized for the current load, pulling the box down fast and short cycling
- On a merchandiser, a failed air curtain or a night curtain left in place during trading
Where the sensor sits, and what the box reads on a calibrated thermometer at product level rather than at the controller display.
Running constantly, never cycles off
- Dirty condenser, so the system runs longer to shed the same heat
- Low charge, so the box cannot reach setpoint however long the compressor runs
- Door gasket failed, door out of alignment, or a closer that no longer pulls the door shut
- Warm product loaded in volume, or a room carrying more load than it used to
- Evaporator iced, so the fans are moving air across ice rather than a coil
- Restriction at the metering device or a clogged filter drier starving the evaporator
- System undersized for the room, which is a design problem rather than a fault
Suction and discharge pressures with superheat and subcooling, read together. Those four numbers separate an undercharge from a restriction from a compressor that is no longer pumping.
Ice built up on the coil
- Defrost cycle not initiating, from a failed timer, defrost board or controller
- Defrost heater open, or one element in a bank burned out so the coil only part clears
- Defrost termination thermostat failed, ending the cycle before the coil is clear or letting it run long
- Warm humid air entering constantly through a failed gasket, a propped door or a strip curtain that is torn
- Low charge, which lets part of the coil run colder for longer than it should
- Evaporator fan not running, so with no airflow the coil temperature collapses and every bit of moisture reaching it freezes on
- Drain line frozen, so meltwater backs up into the pan and refreezes onto the coil
Whether a defrost actually runs and completes. We force a cycle and watch it, then check the termination device and the heater circuit.
Water on the floor
- Condensate drain line blocked with slime or debris, usually at the first fitting or the trap
- Drain line frozen on a freezer because the drain heat tape has failed
- Drain pan cracked, corroded through, or sitting out of level after a service
- Coil sweating heavily because a door or gasket is letting humid air in
- Evaporator icing and then melting on each defrost, dumping more water than the pan can carry
- Condensate pump failed, or its float switch stuck
The drain path from the pan outward. Water on a kitchen floor is a slip hazard and an inspection finding before it is a refrigeration problem, so the drain gets cleared and proven to flow first.
Unusual noise, rattle or knock
- Fan blade out of balance, or clipping ice, a shroud or a loose wire
- Fan motor bearings worn, which reads as a squeal or a growl that changes with speed
- Compressor mounting grommets collapsed, letting the compressor drum against the base
- Liquid refrigerant returning to the compressor, which knocks and shortens compressor life fast
- Contactor chattering from pitted contacts or low control voltage
- Line set or panel vibrating against the structure, which is noisy and harmless until a line rubs through
Where the noise comes from with the system running, and whether it changes on start, on defrost or on the fans alone. A blade clipping ice is a cheap fix. A knock inside the compressor is a sealed system repair.
No ice, or production dropped off
- Scale on the evaporator plate, which is the single most common cause on Long Island water
- Water filter clogged, or the inlet water valve failing to open fully
- Harvest cycle not completing, so the sheet never releases and the machine stalls
- Water pump or distribution tube blocked, leaving part of the plate dry
- High ambient air or high incoming water temperature, which both stretch cycle time
- Dirty condenser or low refrigerant charge
- Failed control board, thermostat or bin level control
The water side before the refrigeration side. Scale, filtration and water supply are cheap to check and cheap to correct, and they have to be cleared before anyone puts gauges on the machine.
Energy bill climbing with no other symptom
- Fouled condenser coil on one system, or on several at once
- Low charge on a system nobody has flagged because the box still reads cold
- Door gaskets hardened or torn, and doors dropped out of alignment on worn hinges
- Anti-sweat heaters on glass door cases running full time when the case has a control for them
- Defrost running more often, or longer, than the box actually needs
- Evaporator or condenser fan motors drawing high as bearings wear
Run time and amp draw measured against what the data plate says the unit should pull. That comparison tells you whether you are looking at one machine or at every machine in the room.
This is a starting point, not a diagnosis. Two boxes with identical symptoms fail for different reasons, and the pressures, temperatures and amp readings on the day decide which one you have.
What actually fails, and what it does to the box
Every commercial refrigeration system moves heat out of a box using the same four components in a loop. A compressor raises the pressure and temperature of the refrigerant vapor. A condenser dumps that heat to the air and turns the vapor back into liquid. A metering device drops the pressure. An evaporator absorbs heat from the box and boils the refrigerant back into vapor. Around that loop sit the parts that decide whether it works in a real kitchen: fans, controls, a defrost cycle, doors and a drain.
Compressor
Valves wear, windings fail, and grommets collapse. A compressor that has been running against a filthy condenser for a year fails from heat, not age. Replacing one without finding what killed it buys the same failure again.
Condenser coil and fan
Grease, dust and salt block the fins and the fan motor wears. Head pressure climbs, run time stretches, and the compressor carries the extra heat for as long as the coil stays dirty.
Evaporator coil and fan
Fan motors seize, blades warp, and coils foul or ice. Air has to move across the coil at the right rate. A blocked or iced evaporator looks exactly like a refrigerant problem until you look at it.
Refrigerant charge and leaks
Refrigeration systems do not consume refrigerant. If the charge is low, there is a leak, and it is usually at a flare, a braze joint, a Schrader core, or a coil that has corroded. Finding it is the repair.
Defrost and its termination
Timers, boards, heaters and the termination thermostat that ends the cycle. When termination fails, the coil either never clears or the box warms on every cycle while the refrigeration itself tests fine.
Controls, thermostats and sensors
Digital controllers drift, probes fail open or short, and a sensor moved during a cleaning reads the wrong air. The box behaves badly while the refrigeration is perfectly healthy.
Doors, hinges, closers and gaskets
Gaskets harden, tear and pull away from the channel. Hinges sag and doors stop closing square. Every hour of that is warm humid air entering the box, which becomes ice on the coil and money on the meter.
Drain lines, pans and heat tape
Drains grow biofilm and block, and freezer drains freeze when the heat tape fails. The water goes somewhere: onto the floor, or back under the coil to refreeze.
How a technician gets from your symptom to the cause
Refrigeration diagnosis has an order to it, and the order matters because the cheap checks eliminate the expensive ones. A technician who opens a sealed system first has skipped the work. Here is how the visit actually runs.
Read the box and the history
Current air temperature at the sensor and at product level, the setpoint, what the controller is displaying, and any fault code. Then the questions: when did it start, has it done this before, what changed in the room, and what time was the box last in range.
Look and listen before touching anything
Is the compressor running. Are both fans turning. Is the coil iced. Is the condenser packed with lint. Are the doors closing and sealing. Is there water where there should not be.
Condenser, airflow and cleanliness
A coil clean happens before any measurement that high head pressure could distort. Take pressures on a blocked condenser and every number afterwards is describing the dirt rather than the fault.
Electrical checks
Supply voltage, control voltage, contactor condition, start and run capacitors, overload, and running amps on the compressor and both fan motors against the data plate. A compressor drawing locked rotor amps and cutting out on overload is a different fault from one that runs quietly and cools nothing.
Gauges, superheat and subcooling
Suction and discharge pressures converted to saturation temperatures, then superheat at the evaporator outlet and subcooling at the condenser outlet. High superheat with low subcooling is an undercharge, because there is not enough liquid in the system to fill the condenser. High superheat with normal or high subcooling is a restriction at the filter drier, the liquid line or the metering device, because liquid stacks up ahead of the blockage instead of reaching the evaporator. Low superheat is a flooding evaporator, usually an expansion valve overfeeding or stuck open. Both pressures drifting together toward each other with the compressor running points at worn valves.
Defrost and controls
On any freezer, and on any coil showing ice, a defrost cycle is forced and watched end to end. Does it initiate, does the heater draw current, does the termination device end it, does the drain carry the water away. Then controller setpoints, differentials and probe placement are verified against what the equipment needs.
Leak search when the charge is down
An electronic leak detector over the likely joints, ultraviolet dye where a leak is intermittent, and a nitrogen pressure test on a system that has lost its charge and shows nothing. Refrigerant is recovered rather than vented, the leak is repaired, the system is evacuated and then weighed in to the manufacturer's charge.
What happens when we get there
Emergency calls are answered around the clock, every day of the year, and the typical on site response across Suffolk and Nassau County is inside 90 minutes. Office hours are Monday to Friday, 8am to 5pm. Restaurant and retail work is regularly scheduled before open or after close so a repair does not cost you a service period on top of the fault.
Trucks are stocked with the common failure parts for the major commercial refrigeration brands: contactors, capacitors, fan motors, defrost heaters, termination thermostats, gaskets and controls. When the fault is one of those, the repair happens on the same visit. When a sealed system component or a specialty part has to be ordered, you hear the lead time at the visit, along with whether the box can be run in a limited way meanwhile and what that means for your product.
What the repair costs is settled on site, and the things that move it are predictable. A fault outside the sealed system, a contactor or a fan motor or a set of gaskets, is the cheapest kind of repair. Anything that means recovering refrigerant, brazing a joint, evacuating and weighing a charge back in is a longer visit and a larger number. After that it comes down to whether the part is current or discontinued, whether the equipment can be reached without stripping a line out, whether the work has to happen after close, and whether you are buying one repair or a system that needs three things put right at once.
Before we touch the equipment
We ask what time the box was last in range and note it, because that is the number a health inspector asks for. Product that has to move gets moved first.
Diagnosis, then a number
You get the fault, the repair, and the price before the work starts. Nothing appears on the invoice that was not said out loud on site.
The pulldown is watched
A repair is not finished when the compressor starts. We stay with it until the box is pulling down and holding, and the readings are recorded.
You get the paperwork
Findings, readings, parts fitted and any refrigerant recovered or added, written up for your maintenance file and your inspection records.
Would definitely recommend. Staff showed up on time. The staff was friendly and knowledgeable. Repaired a leak and got me back running without any surprises or extra charges.
Repair or replace, and what actually decides it
Age on its own decides nothing. A twelve year old walk-in condensing unit that has been cleaned twice a year and never lost a charge is worth repairing. A six year old reach-in that has burned two compressors because the condenser sits in a dead-air corner is not, unless the corner gets fixed too. What decides it is the cost of the repair set against the remaining service life you are buying, and the honest number for remaining life comes from the condition of the cabinet and the sealed system, not the date on the plate.
Repair usually wins when
- The failure is outside the sealed system: a fan motor, a contactor, a control, a heater, a gasket set
- The cabinet, insulation, doors and coils are sound
- The system has held its charge and the leak, if there is one, is accessible
- The equipment is still inside the service life its class generally reaches, broadly seven to twelve years for self contained reach-ins and prep tables and ten to fifteen for a walk-in condensing unit
- This is the first significant failure rather than the third in two years
Replacement usually wins when
- The compressor has failed and the rest of the system is the same age and has had the same life
- The system has lost a full charge more than once and the leak is inside a foamed-in coil or panel
- Cabinet insulation is waterlogged, panels have delaminated, or the floor has failed
- The box was never sized for the load it carries now, so it runs almost continuously in normal service
- Running cost and downtime have quietly become an annual expense larger than the payment on new equipment
When replacement is the honest answer, you get the number for a new system supplied, installed, permitted and inspected next to the number for the repair, along with what the repair realistically buys you in remaining life. Then you decide, not us.
Refrigerant work, leaks and what EPA 608 means for your equipment
Anyone who opens a refrigeration circuit on your premises is required to hold EPA Section 608 certification. It is a federal requirement under the Clean Air Act, not a trade badge, and it covers how refrigerant is recovered, how it is handled, and how systems are evacuated and charged. Our technicians hold it. In practice it means the refrigerant in your system is recovered into a recovery cylinder rather than released, the equipment used is certified for it, and the work is documented.
It also changes what counts as a repair. Adding gas without finding the leak buys a few weeks, loses the charge again, and puts the same money into the air a second time. On larger commercial systems the leak repair and the records that go with it carry regulatory obligations set by the size of the charge and the refrigerant in it, and those records are part of what you get from the visit.
A lot of the refrigeration still running on Long Island was built for R-22. Production and import of R-22 in the United States ended in 2020, so what remains in the supply chain is reclaimed or recycled and priced accordingly. On a small system with a slow seep, topping off can still be the right call. On a system that has dropped its full charge twice in a year, it is money going into the atmosphere, and we will say so rather than sell it to you. Newer equipment runs on refrigerants with lower global warming potential, which narrows what can be installed and is worth understanding before you specify a replacement.
What Long Island does to refrigeration, and what stops it coming back
Condensers on the South Shore, along the bays and out toward the forks corrode from the fin edges inward in salt air. Aluminum fins pit, copper tube joints weep, and a coil that looks fine from three feet away has lost a chunk of its ability to reject heat. That shows up first as longer run times and higher bills, then as a compressor failure in the first real heat wave. Coils in that environment want rinsing more often than the manual says, and coated coils are worth specifying on a replacement near the water.
A lot of Suffolk County restaurant and retail space was never built around the refrigeration it now carries. Condensing units end up in back corners with no ventilation, in basements that run hot, or on roofs with a parapet blocking discharge air. Grease-laden kitchen air fouls a coil in months rather than years. Summer humidity loads evaporators and drain pans hard, and then winter drops outdoor ambient far enough that an outdoor condenser without head pressure control cannot build enough pressure to feed the metering device, which reads to the owner as a box that cools fine in July and badly in January.
The service work that answers those conditions is the same list on every site.
- Condenser and evaporator coils cleaned on a schedule set by the environment, not the calendar
- Refrigerant charge verified by superheat and subcooling rather than by sight glass alone
- Door gaskets, hinges and closers checked and adjusted before they start costing energy
- Drain lines flushed and freezer drain heat tape proven
- Contactors, capacitors and motor amp draws logged so a trend is visible before it is a failure
- Controller setpoints and probe placement confirmed against what the equipment actually needs
Commercial refrigeration repair questions we get asked most
What do you need from me when I call?
The equipment type, the temperature it is reading and the address. That decides which truck goes out and what it carries, and it often decides the likely fault before anyone leaves the yard. If you can get to the data plate, the brand, model number and refrigerant type narrow it further.
My cooler is running but the food is too warm. Is that the compressor?
Usually not. A compressor that has failed outright normally leaves you with a box that is not cooling at all rather than one that is cooling badly. A box that runs and holds warm points at the condenser, the charge, an iced evaporator or a control problem first. Condemning a compressor without pressures, superheat, subcooling and amp readings is how owners end up paying for a part that was never the fault.
Do you work on every brand of commercial refrigeration?
Our technicians are trained and factory qualified on all the major commercial HVAC and refrigeration equipment brands, and we service what is already in your building rather than only what we sell. Older equipment and discontinued models are normal work; what changes is parts availability, and you hear that at the visit.
What should I do while I wait for the technician?
Write down the time the box was last in range. Move what you can into a working box, stop opening the door, and leave the equipment alone. Cycling power on a system that has tripped a safety clears the evidence needed to find the fault. If there is water on the floor, get it dried and marked before somebody slips.
Tell us what the box is doing
Give us the equipment, the reading and the address and we will tell you what it most likely is before anyone is dispatched. Serving Long Island businesses since 1999, with more than 6,000 completed commercial and residential projects behind us.
- 24/7 emergency service
- EPA 608 certified
- Licensed and insured
- Suffolk and Nassau County