What is the dumbest callback that you have been on to cover yours or someone elses a$$? I am sure someone has covered me before, but I know I have never done something this bad.
While working in Las Vegas we serviced a gym. A guy went out on a service call there and called me and said hey this unit is iced up and there is no reason for it. I told him to deice it and check it thoroughly, if he had questions to give me a call back. Didn't hear back figured it was fixed. Spoke to him in the morning and he said well it was low on freon, but I couldn't find a leak (r-22 using an H10pm). So we need to go back right, no was his response. I didn't know but that same day they called back and they sent him back out.
2 days later I go out and the unit is iced up and the compressor is cycling like crazy. I put my guages on the unit and the head pressure was running 550 psi, and the suction was in a vacuum. I checked the drier and it had a 60* difference across it. So I get all my stuff on the roof. The unit held 22 pounds of R-22, I removed 42 lbs. When all said and done he could have repaired this unit in under 3 hrs, took me all day as I only had one recovery bottle.
One more, went to help a guy install a unit he had sold. Talking to the home owner and discovered that his thermostats kept going bad and the tech had told him that there was a short somewhere that was backfeeding high voltage to his thermostat, causing it to burn the circuit board in the t-stat. So I investigated a little and found that he needed a common wire. I hooked the common to the stat and at the unit and asked the homeowner if he really wanted a new unit as it was not necessary. He opted out of it, I went to the parts house picked up an add a wire and installed it. Got a $500 gift card from the owner of the company and a customer that only I was aloud to go back to until the day I left.
I believe honesty and thorough checking of equipment makes for many happy customers.