Skilled trades

Systematic diagnostics, planted faults, service reports, and field decision trees.

Intermediate · 12 weeks · self-paced · The PATG Group

Twelve-week diagnostics course — electrical method, airflow-first habits, heating and cooling fault trees, heat-pump mode awareness, planted-fault practice, and service reports. Included with All Access.

12 weeks with autograded assessments. Included with All Access. Finish to lock completion and keep a printable certificate.

What you'll learn

• Apply a structured electrical diagnostic method
• Prioritize airflow before charge on cooling complaints
• Walk heating no-heat and safety-trip trees
• Recognize heat-pump mode and defrost/aux symptoms
• Write clear service reports from observations and measurements

Course content

12 sections

1. Week 1 Diagnostic method and safety first
2. Week 2 Schematics and multimeter method
3. Week 3 Heating no-heat and safety-trip trees
4. Week 4 Airflow-first diagnosis — static and ΔT
5. Week 5 Coil, filter, and blower fault trees
6. Week 6 Cooling performance — SH, SC, and leak clues
7. Week 7 Heat pumps — reversing valve and modes
8. Week 8 Midterm — diagnostic fundamentals
9. Week 9 Defrost, aux, and emergency heat
10. Week 10 Dual-fuel awareness and decision trees
11. Week 11 Planted-fault practice and service reports
12. Week 12 Scenario final and communication closeout