HVAC
A cracked heat exchanger doesn't introduce itself before it kills someone.
A cracked heat exchanger doesn't introduce itself before it kills someone — it just leaks carbon monoxide into a house where nobody's testing for it until you show up. Run the full safety check, combustion to controls, and leave the homeowner with proof you checked, not just your word that you did.
20 Questions
~20 min To complete
4 Sections
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1
Unit Identification
4 questions Gerald Tran — 804 Ridgecrest Dr, Scottsdale, AZ 85254
Carrier 58CVA090 — Serial: 3818A12345
2014 Confirm from data plate or permit records
2023-10-15
2
Combustion & Heat Exchanger
6 questions ✓ Pass
✓ Pass
4 Safe threshold is below 35 ppm
Blue — steady
✓ Pass
📷 Photo attached
3
Venting & Flue
4 questions ✓ Pass
✗ Fail Bird nest partially blocking PVC termination elbow. Removed on site.
Yes
✓ Pass
4
Electrical, Controls & Performance
6 questions 62 Typical healthy range: 40–90 ohms depending on manufacturer
Yes
118 Target: 120–140°F depending on system
68
✓ Pass Rise: 50°F — nameplate spec: 40–70°F
Dirty — replaced
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