Commercial Rooftop Unit Repair in Seattle, WA
Commercial RTU repair for offices, retail, and tenant floors—packaged rooftops, economizers, and compressor electrical. We handle no-cooling calls, high-pressure lockouts, and economizer faults; not residential home HVAC tune-up packages.
Same-day scheduling when capacity allows, with priority for RTU lockouts, no-cooling, and business-down comfort calls—aligned with how we describe service on the A/C Dr. Naz homepage.
Commercial RTU breakdowns we diagnose
The useful first split is whether the condenser is rejected, the blower is moving air, or the outdoor-air damper never left the last command. A high-head lockout with a dirty condenser coil is a different ticket than a contactor that chatters on 3-phase, and neither is fixed by swapping the thermostat schedule.
What we see on commercial RTU systems
- RTU not cooling or uneven comfort on occupied floors
- High-pressure lockouts and condenser airflow faults
- Economizer dampers stuck—compressor runs when free cooling should work
- Compressor electrical faults, contactors, and 3-phase staging
- Belt, blower, and static pressure problems reducing RTU capacity
How findings get communicated on site
On a packaged curb unit we command the outdoor-air damper and watch the linkage, not just the controller status light. If the blade does not move, or the mixed-air temp never changes, the compressor can run for hours on air it should have dumped outside. Wet weather on an open low-slope roof seizes that linkage long before the compressor itself is weak.
RTU economizer troubleshooting guide
RTU high-pressure lockout guide
Commercial RTU not cooling (troubleshoot guide)
Make-up air (MUA) blower diagnostics
Total external static pressure testing
Packaged-roof overview, not a second city page.
Commercial RTU repair in the field
Bring a nameplate photo if you can stand at the curb safely, plus which floor is hot. Shared roofs often have more than one packaged unit, and opening the wrong cabinet wastes the visit.
Commercial RTU service area coverage
Commercial rooftop unit repair in Seattle from this page stays on packaged curbs in the corridors below. Tell dispatch the neighborhood and the symptom—no-cool, lockout, or a damper that will not modulate—so the arrival window is honest.
Seattle corridors we routinely serve
- SoDo / stadium district: Event venues and tenant floors with packaged RTUs and tight mechanical rooms.
- Capitol Hill / central Seattle: Dense restaurant and retail rows with rooftop units behind tight BOH layouts.
- Downtown / waterfront hospitality: Hotels and venues where RTU lockouts back guest comfort and operations.
- Belltown / South Lake Union: Office cafes, tech-campus food service, and tenant floors with packaged RTUs.
Not sure we can reach you today? Call (425) 535-8990 with the site address and symptom—we will confirm whether we can schedule the visit you need.
Other commercial RTU service areas
Nearby pages for the same packaged-roof work: Tukwila, Bellevue, Kirkland. Regional overview: commercial rooftop unit repair hub.
Technical field reports
RTU economizer troubleshooting · RTU high-pressure lockout guide · RTU not cooling guide
Use the field notes above for damper linkage, head pressure, and no-cool tickets. Do not treat this strip as a second service menu.
For indoor environmental quality context, see the EPA indoor air quality overview and OSHA indoor environmental quality guidance.
RTU repair vs. AC and heat pump silos
This page is packaged-roof work: economizers, lockouts, and compressor electrical on curb cabinets. Cooling-only split or condenser work belongs on commercial AC repair. Heat-pump heating faults belong on commercial heat pump repair. Whole-building heating and mixed systems belong on commercial HVAC repair. Coolers and freezers are a different trade; we do not take those calls from this page.
Commercial RTU repair FAQ
What should be ready before a lockout call in Seattle?
Street address, roof access (hatch, ladder, or escort), which floor is hot, and a nameplate photo if you can get it safely. The lockout code or a photo of the controller screen saves a second trip for the wrong part.
How do you tell an economizer fault from a compressor fault?
If outdoor air is cool enough to carry the load and the damper never leaves minimum, the compressor runs and head pressure climbs. We confirm command versus blade position before we quote a compressor.
Why not open the first cabinet on a shared roof?
No. Hatches, labels, and which tenant is hot come first. Opening a neighboring curb burns the visit and does not cool the floor that called.
When does EPA Universal refrigerant recovery apply?
Yes when the circuit needs to be opened. EPA Universal applies to that work. We do not invent a charge size from the floor; the nameplate and gauges decide it.
What still sets the earliest arrival window?
Earliest arrival still hinges on drive radius, queue depth, and whether a part is on the truck. Confirm that live when you speak with dispatch.
Packaged unit down? Call with the site address and the lockout or no-cool symptom.
Earliest arrival still hinges on drive radius, queue depth, and whether distributors have stock—confirm live when you speak with dispatch.
