In the Spring I installed a sub-panel in a ladie's condo. There was no way to get a 20-amp, 240 volt circuit for an electric wall oven out of her old fuse panel.The existing panel was on a shared 100-amp riser with the apartments above and below her. I first suggested she should not re-arrange her kitchen and go back to a standard gas range. She insisted on a gas cooktop and separate electric oven. "There has to be a way you can help me, Pat". Thus, the sub-panel. I reasoned that the oven only drew about 8 or 9 amps and that would be less power draw on the riser than some of the new vacum cleaners out now. ......Fuses blow, investigations by the building management, I go back and un-install the sub-panel at no charge. Now she wants her $850.00 back for the original install. Should I send her a check or fight?
I wish you had mentioned the nameplate rating of that electric oven. The ones I've installed have been wired at 40-amp, 240-volt (much more than a vacuum). Anyway, my personal opinion is that you did the design work on this one, you should be responsible for it. The only way I see that you could have saved yourself on this one is if you had agreed in advance that you didn't think it would work, but you were willing to try it as an experiment at her expense.
Sorry Pat, I have to agree with Roger,I would give her the money back.You should've passed on the work originally,sometimes you've got to tell these folks "that it can't be done".I have a hard time doing that sometimes myself .