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

References

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