Purpose
Guide technicians through diagnosis — understanding the problem, identifying root cause, and determining solutions to present.
When to Use
- After arrival and initial walkthrough on every service call
Procedure
1. Listen to the Customer
Let them fully explain without interrupting
Ask: "When did this start?", "Has this happened before?", "Any recent plumbing work?"
Take notes in ServiceTitan
Acknowledge: "I understand — let me take a look."2. Perform Your Diagnostic
Inspect the reported problem area thoroughly
Check related systems — a leak in one area may originate elsewhere
Use appropriate tools: camera, pressure testing, CO meter, water quality test
Perform water pressure safety check (static and dynamic) on applicable jobs
Perform bucket blast on water heater when applicable — photo the results
Do NOT start repairs until you have a clear diagnosis3. Identify the Root Cause
Determine the actual cause, not just the symptom
Look for related issues: failing water heater — also check expansion tank, PRV, connections
Check for code violations or safety concerns (open exhaust vents, missing CO detectors)
Document everything — photos, measurements, readings4. Check In Before Presenting
Post findings in the Slack job channel using numbered check-in process
Get guidance from supervisor or coach if complex or unsure
For larger repairs, post options internally for review before presenting
This is part of call-by-call coaching — use it5. Educate the Customer
Show them what you found — photos, point to the issue, explain simply
Show bucket blast results, water quality test, or pressure readings
Explain why it matters and what happens if not addressed
Be honest — do not exaggerate but do not downplayImportant Notes
- The diagnostic is where you earn trust
- Never skip the check-in, especially on larger jobs
- Water quality testing is becoming standard diagnostic practice
- If it is not in ServiceTitan with photos, it did not happen
Related SOPs
- Options Presentation (Good/Better/Best) — presenting solutions
- Photo Documentation Requirements — what to photograph
- Diagnostics & Troubleshooting cards — system-specific procedures