Residential No-Cool — Split System Not Cooling

EPA 608 practice · Type IINATE-style practice · Basic electrical

Homeowner says the air handler is blowing but the house has been getting warmer since yesterday afternoon. Unit: 3-ton R-410A split system, 9 years old, single-stage condenser, gas furnace air handler. This is one of three free graded decision labs from Residential HVAC Service & Diagnostics — you choose each next check, readings fill in as you work, wrong turns are coached, and you are scored on cause, efficiency, safety and verification. No login required, about 14 minutes.

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Residential HVAC Service & Diagnostics

Refresher · 9:48 left

foundation

United Kingdom & Ireland skin

Nameplate: 230 V 1-phase · 50 Hz · BS 7671 / ETCI-NSAI. Working temperatures on this track are °C. Refresher run — one hint per decision, wrong region voltage or scale fails the run.

The call

Homeowner says the air handler is blowing but the house has been getting warmer since yesterday afternoon.

Equipment: 3-ton R-410A split system, 9 years old, single-stage condenser, gas furnace air handler
Ambient: 36 °C
Site notes: Thermostat is set to COOL at 22 °C, space is 29 °C. Indoor blower runs. Outdoor unit is silent when you walk up to it.

Decision 1 of 4

You are standing at the outdoor unit on a 36 °C afternoon. Nothing is turning.

What is your first action?

This is one of three free labs

Three free diagnostic labs. HVAC Technical Training — Paths A–D unlocks the remaining labs, lessons, full exam banks, timed mocks, and the Academy certificate. We do not issue EPA 608 or NATE credentials.

Enrol in Paths A–D — $697 What enrolment includes

90 days of graded labs and mocks from enrolment. Your Academy certificate stays verifiable after that. Official exam fees are paid to the issuing body, not us. Access is not a licence and not lifetime.

Train here to pass their assessment — and to be the technician a shop can send once. You work real calls on this region's voltage, frequency and °C. We grade the turns the exam and the job both fail.

We stand behind this material. We research the live syllabus and we keep the labs aligned. When the authority updates the rules, we update the training. You are not buying a question-bank we will not defend.

Exam preparation only. EcoPowerHub Academy prepares you for relevant refrigerant-handling and technical exams. We do not issue EPA 608, NATE, HVAC Excellence, SAQCC Gas, EPRA, NITA or ESSCI credentials — those are issued by the respective authorities, and their exam fees are separate. Labs are educational. Work on HVACR systems must be performed by qualified persons under applicable law.

Where this lab sits

This is one module lab from Residential HVAC Service & Diagnostics. The full path builds the rest of the diagnostic sequence around it, each module ending in a graded lab like this one.

Open Residential HVAC Service & Diagnostics Next lab: Residential No-Heat — Gas Furnace Short Cycling on Ignition Next lab: Frozen Coil / Airflow Restriction Next lab: Residential Over- and Undercharge — Poor Cooling Call

Studying for an exam too?

Free practice questions with explained answers, then come back to the labs. Exam preparation only — we do not issue EPA, NATE or other official credentials.

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