Leaving the appliance (and your work area) *cleaner* than it was before you arrived---is another win-win with the customer.
Quadruple check the refrigerator / dishwasher / washer water hoses---and at both ends. Even if you haven't touched them. Chances are someone else (before you arrived) has---and left the hose(s) only finger-tight.
A little movement of the appliance---and the hose begins to leak after a few cycles (or use of the appliance).
The sudden pressure build-up in a hose---when the valve closes---can spring a drip-drip-drip type leak.
Gas pipe connections---tighten 'em---leak test 'em. Check again. Replace the gas pipe when in doubt of it's overall condition.
Floors---wood or congoleum---notify the customer of any/all blemishes---the moment that you enter the kitchen or laundry room.
Most customers (in my area at least) are appreciative of a technician that demonstrates immediate *situational awareness*.
Not some guy plodding through their home in a "Mental Holiday" state-of-mind.
Lastly---if you *do* goof/screw-up---own up to it.
People are amazed when someone takes responsibility for their errors---they'll also likely continue to use your services---even if an insurance claim was required. Been there,done that.
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I have a special topic for tonight's Office Hours webinar on electric circuit troubleshooting and EEPs. If you've taken the Fundamentals course or watched any of my Youtube videos, you know that EEPs are a topic near and dear to my heart. EEPs = Electrically Equivalent Points. Identifying EEPs on a schematic is a key skill for any appliance tech today. Another special feature about this Office Hours: in addition to the usual Academy students and Professional Appliantologist members, Senior Appliantology Fellows and Legacy Techs at Appliantology are also welcome to join us for this Office Hours. Just click into the topic below to RSVP and to get the connection info.