Getting Commercial Cooling Back Online

A chiller down in an occupied building is rarely just a comfort problem. Server rooms, commercial kitchens, medical spaces and process equipment all depend on chilled water, and the consequences of an outage climb quickly. Our work on chillers is diagnostic first — we identify what actually failed and why, rather than replacing parts until the symptom disappears.

We service air-cooled and water-cooled machines across the Eastern Sierra, from packaged units serving a single building to larger plants tied to cooling towers and distribution loops.

Warning Signs Your Chiller Needs Repair

Leaving Water Temperature Drifting Above Setpoint

A machine that can no longer hold its chilled water setpoint under normal load has lost capacity somewhere — refrigerant charge, compressor performance, heat rejection or flow. It is the clearest early indicator that something has changed.

Repeated Safety Trips and Lockouts

Low-pressure, high-pressure, freeze-stat and oil-safety trips are the machine protecting itself. Repeatedly resetting a lockout without diagnosing the underlying condition risks turning a contained fault into compressor damage.

Short-Cycling Compressors

Compressors that start and stop rapidly never reach stable operating conditions and never properly return oil. Short-cycling is often the visible symptom of undersized load, a fouled evaporator, or a controls problem rather than a compressor fault.

Ice on the Evaporator or Suction Line

Frost where there should not be any points to low refrigerant charge, restricted flow through the evaporator, or an expansion device that is not metering correctly. Continuing to run an iced machine risks liquid returning to the compressor.

New Noise or Vibration From the Compressor

Knocking, rattling or a change in pitch usually signals mechanical distress — bearings, valves, or liquid slugging. Unlike most chiller faults, this one tends to get expensive quickly if the machine keeps running.

Oil Level or Oil Pressure Out of Range

Oil that is low, dark, or not returning properly is a warning about both lubrication and refrigerant migration. Oil analysis often reveals a developing problem well before a trip occurs.

What Usually Causes Chiller Failures

Condenser Fouling and Poor Heat Rejection

On water-cooled machines, scale and biological fouling in the condenser tubes raise head pressure and cut capacity. On air-cooled machines, dust, cottonwood and debris in the coil do the same thing. Either way the compressor works harder for less cooling.

Refrigerant Leaks

Vibration, thermal cycling and aging joints eventually produce leaks. Beyond the capacity loss, running undercharged causes high superheat and elevated discharge temperatures that degrade oil and shorten compressor life.

Chilled or Condenser Water Flow Problems

A chiller is only as good as the flow through it. Plugged strainers, failing pumps, closed balancing valves and air in the loop all reduce flow, and low flow across the evaporator is a common path to a freeze trip.

Electrical and Control Faults

Contactors, starters, current transformers, sensors and control boards all age. Loose lugs and pitted contacts create heat and voltage imbalance, which is one of the more common causes of motor damage on three-phase equipment.

Deferred Maintenance Catching Up

Most catastrophic chiller failures we see were preceded by months of small, ignored indications — a creeping approach temperature, an occasional trip, a slightly low oil level. Trend data is the cheapest diagnostic tool a facility has.

What to Expect During a Chiller Service Visit

We evaluate the machine under load wherever it is safe to do so, because a chiller sitting idle hides most of what we need to see.

Full refrigeration-side readings: pressures, temperatures, superheat, subcooling and approach
Electrical inspection including voltage, amperage balance, contactor and starter condition
Evaporator and condenser performance evaluated against design
Flow verification on both the chilled water and condenser water circuits
Controls, safeties and staging sequence reviewed
Leak inspection, oil condition assessment, and a clear explanation of what we found

Equipment We Service

We repair and maintain commercial chillers including scroll, screw and reciprocating machines, in both air-cooled and water-cooled configurations, along with the pumps, controls and heat rejection equipment they depend on.

Daikin
Mitsubishi
Lochinvar
Raypak
And more

Preventive Maintenance and Trending

Chillers give a great deal of warning before they fail, but only to someone reading the data. Approach temperatures, superheat and subcooling, amp draw and oil condition all drift measurably before a machine trips. Buildings that log those readings catch problems as maintenance items; buildings that do not tend to meet the same problems as emergencies.

We build maintenance intervals around how the machine is actually used — a chiller serving a year-round server load needs a different schedule than one that runs four months a year.

Pre-season inspection and performance baseline before the cooling season
Refrigerant leak inspection and charge verification
Condenser and evaporator cleaning appropriate to the machine type
Electrical inspection including contactor condition and amperage balance
Oil analysis and lubrication service
Controls and safety verification, with readings documented for trending

Repair, Replace, or Restore Capacity

When a chiller has a significant failure, the useful question is not simply repair versus replace. It is what the building actually needs from the machine over the next several years. A compressor failure on an otherwise sound machine with a healthy control system is usually worth repairing. The same failure on a unit with a leaking condenser, obsolete controls and no parts availability is a different conversation.

We give you the condition of the whole machine — not just the failed component — so the decision is made with the full picture rather than under pressure on the day it goes down.

Chiller Repair Across the Eastern Sierra

We serve Mammoth Lakes, Bishop and the surrounding Eastern Sierra communities, with 24/7 emergency service when a cooling failure puts building operations or equipment at risk.

Our Mammoth Lakes shop and our Bishop location at 80 Virginia Street let us cover the valley and the high country from two directions. We regularly serve Mammoth Lakes, Bishop, West Bishop, Big Pine, Round Valley, Crowley Lake, Swall Meadows, Sunny Slopes, Chalfant, Aspendell, Dixon Lane-Meadow Creek, Wilkerson and Mesa.

The spread between those communities matters for equipment selection and service planning. Bishop sits near 4,150 feet while Mammoth Lakes is close to 7,880 feet, so two buildings twenty minutes apart can face very different design temperatures, combustion requirements and snow loading. We account for that difference rather than treating the region as one climate.

Chiller Repair