Free 🧰 Practical LLM Lessons

Practical LLM: HVAC Tune & Triage

Use error codes and symptoms to build a diagnostic tree, parts list, and client update.

Published January 8, 2026

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Practical LLM: Plumber Diagnose & Quote

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Practical LLM: Delivery Route & Rephrase

What you are practicing

Turn thermostat codes + symptoms into a clear triage plan and customer ETA.

Can You Guess?

Thermostat shows E1 low-pressure error; unit short-cycles. What should the model include before proposing parts?

HVAC triage prompt pattern

Follow the steps and watch each checkpoint light up as you progress.

1

Step 1: List inputs

Capture model type, error codes, symptoms, indoor/outdoor temps.

2

Step 2: Safety + quick checks

Power off, filters, coils, breakers, wiring, condensate drain.

3

Step 3: Diagnostic tree

Ask for a stepwise decision path with pass/fail branches.

4

Step 4: Parts + ETA

Parts per branch, estimated time, and a short customer update text.

Draft your triage plan

  • Paste an error code and symptoms from a recent call.
  • Prompt: “You are an HVAC tech. Using these codes/symptoms, create a step-by-step diagnostic tree with safety first, quick checks, then detailed branches. Add parts/ETA per branch and a 2-sentence customer update.”
  • Regenerate after you add missing details (model, tonnage, refrigerant, filter age).

    • Key Takeaways

    • ✓ Sequence safety and quick checks before deep diagnostics.
    • ✓ Branch the plan based on pass/fail observations.
    • ✓ Include a ready-to-send customer update with ETA.

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    Lesson: Practical LLM: HVAC Tune & Triage

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