Testing Before Leaving the Jobsite Reference

Why this matters

The leading cause of callback service: tech didn't test before leaving. Equipment that "should work" doesn't always. The tech who tests systematically catches problems on-site + saves the return trip + the customer's frustration. This is the field card.

Why testing matters

For customer:

• Confidence the work is done right
• Demonstrates professionalism
• Catches issues immediately (no follow-up needed)

For business:

• Reduces callbacks (lost time + reputation)
• Documents work completion
• Prevents warranty disputes

For tech:

• Catches your own mistakes
• Builds skill in noticing issues
• Customer-witness verification

Universal testing principles

Apply across trades:

1. Test under operating conditions (not just "I plugged it in")
2. Test against specification (manufacturer / customer expectation)
3. Document the result (photo / written confirmation)
4. Customer witness (when appropriate)
5. Address any issue found before leaving

HVAC testing

After any HVAC service:

Cooling mode:

• Set thermostat to call for cooling
• Verify compressor starts
• Verify outdoor fan starts
• Verify indoor blower starts
• Measure return air temp
• Measure supply air temp
• Verify temperature differential (15-20°F typical)
• Listen for unusual sounds

Heating mode (if appropriate):

• Set thermostat to call for heating
• Verify ignition sequence
• Verify flame established (gas)
• Verify blower starts
• Measure supply air temp (130-140°F typical gas; 90-105°F heat pump)
• Verify proper venting (combustion analyzer if available)
• CO test if combustion equipment

Fan mode:

• Verify blower on / off properly

Condensate:

• Verify drainage path clear
• No water under unit

Run for 15+ minutes to verify steady-state operation.

Plumbing testing

After plumbing repair:

Pressure test:

• Turn water back on
• Inspect all connections (visual + touch for moisture)
• Run faucet at hot + cold
• Verify proper flow + pressure
• Check for drips at fitting

Drain test:

• Run water full flow into drain
• Verify drainage without backup
• Check for leaks at trap
• Verify vent function (no gurgling)

Toilet repair:

• Flush 2-3 times
• Verify fills + stops
• Check for leak at base, tank, supply line
• Verify proper handle operation

Water heater service:

• Verify heating
• Check temperature at output
• Test T+P valve (lift briefly)
• Check for leaks at all connections

Electrical testing

After electrical work:

Voltage:

• Verify proper voltage at outlet / switch / fixture
• Check polarity
• Confirm ground

Functionality:

• Switch operates
• Outlet powers test load (light, plug-in tester)
• Light fixture turns on
• GFCI tests + resets

Safety:

• AFCI / GFCI functional
• No exposed wiring
• All connections covered
• Panel labeled

Code compliance:

• Verify installation meets code
• Permit + inspection scheduled

Roofing testing

After roofing work:

Visual:

• All shingles installed correctly
• Flashing properly integrated
• Penetrations sealed
• Drip edge in place

Functional:

• Garden hose test on suspected areas (controlled water)
• Wait for natural rain confirmation
• Customer notification of monitoring

Cleanup:

• Magnetic sweep
• Nail / debris removal
• Property restoration

Appliance testing

After appliance install / service:

Refrigerator:

• Power on
• Temperature drops to setpoint
• Ice maker starts (delay 12-24 hr)
• Water dispenser functions
• Door seal good

Dishwasher:

• Run full cycle
• Verify hot water reaches
• Verify drain
• Check for leaks
• Verify door + safety switches

Washer:

• Run cycle (no load OR small load)
• Verify water fill + drain
• Check vibration
• Verify spin
• Check for leaks

Dryer:

• Run cycle on heat
• Verify temp rise
• Check vent flow at exterior
• Verify safety devices

Range / oven:

• Each burner ignition
• Burner flame quality
• Oven heat to setpoint
• Anti-tip bracket
• Display + controls

Disposal:

• Run water; turn on
• Verify grinding
• Verify drainage
• Check dishwasher knockout

Garage door testing

After service:

• Door opens fully
• Door closes fully
• Reverses on obstruction (safety)
• Photo eyes work
• Lock function (if equipped)
• Manual emergency release works
• Remote / keypad works
• No unusual noise

HVAC system commissioning

Beyond basic test, full commissioning:

• Static pressure measurement
• Refrigerant charge verification (subcooling / superheat)
• Combustion analysis (gas)
• Airflow at each register (balance)
• Thermostat programming
• Customer walkthrough

For new installations / major service.

Sound + observation

Beyond formal tests:

• Listen for unusual sounds
• Smell for anything off
• Watch indicators / displays
• Note anything that doesn't seem right

Sometimes intuition catches what tests don't.

Customer-witness testing

Show customer:

• "Let's test together"
• Run through the function with them
• Have them activate it
• Verify their understanding

Customer sees + remembers the equipment working correctly. Future call: "Was it working when [tech] left?"

Pre-departure checklist

Before driving away:

1. All tools loaded (don't leave anything; can't return for it easily)
2. Equipment / area clean (debris removed)
3. Customer present + acknowledges work (signed work order)
4. Payment processed (per policy)
5. Documents provided (warranty, instructions)
6. Final walk-through with customer
7. Photo documentation complete
8. Service record completed

Missing any = potential issue later.

When testing reveals additional problem

You may find something else:

• "I noticed this while testing your repair"
• Communicate to customer
• Provide estimate if they want it fixed
• Don't push hard (relationship more important than upsell)

If problem is in same scope: address it (warranty would have come back anyway).

Common testing mistakes

• "It worked when I left" without evidence
• Testing only briefly (not under real load)
• Skipping safety device verification
• Not testing all functions
• Skipping customer demonstration
• Not photographing operation
• Departing while issues remain

Trade-specific complete tests

HVAC: 15+ min runtime, all modes, all rooms Plumbing: All fixtures supplied / drained tested Electrical: All affected devices verified Roofing: Water test if possible OR monitor next rain Garage door: All safety + functions tested Appliance: Full cycle of operation Garbage disposal: Run with water for 30+ seconds

Documenting test results

Photo evidence:

• Pre-work condition
• Work being done
• Post-work testing (showing equipment running)
• Final / cleaned condition

Written notes:

• Test results (specific values)
• Customer present
• Any observations

This is your "proof of completion."

When customer questions later

A week out, the call comes: "it's doing it again," or "it never worked right after you left." How that call goes was decided before you pulled out of the driveway.

Go to the record first, quietly. Pull the readings, the photos, and the note that the customer watched it run. Do not lead with it. Lead with listening, because a real second failure and a misremembered one sound identical on the phone.

Separate three different claims. The work failed again (a real recurrence, often a different root cause). The work was never right (your test proves otherwise, or it does not). Something unrelated broke and it feels connected because you were the last one there. Ask enough questions to know which one you are dealing with before you dispatch or argue.

If the record shows it worked and the customer disagrees, show them, do not tell them. "Here's the supply and return temperatures I measured, and here's the photo of the unit running with you standing there." Most disputes end there, not because the customer was lying but because they genuinely did not remember.

If the record is thin, eat it. No test result, no photo, no witness, means you cannot prove the work was complete. Go back, make it right, and treat the gap as the lesson. Arguing from memory against a paying customer is a fight you lose even when you win.

Distinguish warranty from new work in writing, at the door, before you start. "The part I installed is covered. If it turns out the problem is the control board, that's a separate repair and I'll quote it before I touch it." Say it out loud, then put it on the invoice.

Recurrences are diagnostic gold. A part that failed twice in a month is telling you the root cause was never addressed. Go back further in the system, not just to the same component.

Log the callback, always, even when it was not your fault. Callback rate by tech and by job type is the number that finds training gaps and bad parts vendors. Suppressing it to protect a number destroys the only signal you have.

References

• ASHRAE commissioning standards
• IICRC standards (restoration; testing post-mitigation)
• Manufacturer service / install manuals
• Manuall internal: Customer Documentation Discipline, Customer Communication Standards