Service Visit · North Phoenix

Evaporative Cooler Diagnostic and Minor Repair in North Phoenix — October 2025

CompletedOctober 20, 2025

Technicianour technician

Service AreaNorth Phoenix

Visit Invoice Total$299.00

Call (602) 613-3489

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Documented ServiceFindings supported by service notes

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Reported by the Homeowner

Mastercool evap cooler not working, keeps turning on and off.

North Phoenix homeowner · October 20, 2025

The Report

What the homeowner told us

Mastercool evap cooler not working, keeps turning on and off.

Findings & Work Performed

What our technician documented during the visit

I addressed the issue found during the diagnosis and made the necessary repair to restore proper operation. I tightened connections and reset the system to ensure reliable performance.

The Verification

Verification performed

I cycled the system after the repair and confirmed normal operation with stable amp draw and proper thermostat response. I confirmed good airflow and that the unit was running as expected on departure.

— Related Services

How this repair fits into our Phoenix HVAC service

This repair is one example of the AC Repair & Maintenance work AZ Perfect Comfort performs across Phoenix, AZ. You can browse every case study we have published for this type of work in the Evaporative Cooler Diagnostic and Minor Repair case studies archive. Homeowners who join our Comfort Club maintenance membership get every eligible repair backed by our Lifetime Repair Guarantee. For larger repairs and replacements, financing options are available for qualifying projects.

— Parts & Work Performed

Exactly what was installed

Item	Description	Qty	Price
COOLER-TRIP-300	Charge for AZ Perfect Comfort to travel to the homeowner’s residence and diagnose the evaporative (swamp) cooler. May include minor on-site repairs or adjustments as needed.	1	$299.00

Total: $299.00

— Photo Documentation

15 photos from this repair

Every step of this repair was documented on-site by our technician.

Clamp meter measures 140.3 V at a breaker connection using the test probes inside an electrical panel.

Open control box showing low-voltage terminal strip with connected thermostat wires and wiring diagram on the cover inside an evaporative cooler.

Wall-mounted controller for an evaporative cooler with buttons for pump, fan, mode/day, and set/enter.

Evaporative cooler on a shingle roof with service panel open and wiring exposed for diagnostic inspection.

Open electrical panel shows breakers, neutral and ground bars, and connected wiring for HVAC circuit service.

Clamp meter shows 244.9 V across terminals at the control wiring block inside the outdoor unit’s junction box.

Clamp meter shows 0 A with the jaw around a conductor at the electrical panel during diagnostic testing.

Wall thermostat backplate removed, exposing low-voltage control wires and a connector during diagnostic inspection.

Close-up of a control board terminal block with connected low-voltage wires inside an HVAC control enclosure.

Control box interior showing low-voltage and line-voltage wiring connections, wire nut splice, and circuit board terminals inside the cooler.

Electrical junction box mounted on an evaporative cooler housing, with conduits entering and fan blades visible behind the shroud.

Evaporative cooler control box open, showing wiring, terminal board, blue capacitor, and wiring diagram on the inside cover.

Open evaporative cooler control box shows wired terminal strip, relays, and wiring diagram inside the cover.

Wall-mounted digital thermostat displays ROOM 76 °F with system set to Auto and fan options below.

Digital thermostat displays room temperature at 76°F with system in Auto mode and fan setting shown.

— Frequently Asked

Questions about this repair

What was the problem with the AC system in this North Phoenix repair?

The homeowner called for an evaporative cooler issue in North Phoenix, and the technician performed a full system diagnostic. No major faults were found, and only minor adjustments were needed to restore proper operation.

Does AZ Perfect Comfort service North Phoenix?

Yes. AZ Perfect Comfort services North Phoenix and the greater Phoenix Metro area, including same-day repairs like this one. Call (602) 613-3489 to schedule.

Are these AC repairs guaranteed?

AZ Perfect Comfort Diamond Members receive our Lifetime Repair Guarantee — if the same failure returns, the repair is on us. All other repairs are covered by our standard workmanship warranty. Ask your technician about becoming a Diamond Member to unlock the lifetime guarantee.

— Same Problem At Your Home?

Let's get your home feeling "just right" again.

AZ Perfect Comfort has served North Phoenix and greater Phoenix with same-day HVAC diagnostics and repair. Diamond Members get every repair backed by our Lifetime Repair Guarantee.