I think it's his job to get over there and try to make it work, but if you have devices on the network that are interfering with the Envoy, I don't think it's all on him.
This sounds a lot like ordering satellite TV, and then after the install you find out that there is interference to the dish from something (like your ham radio) and it's unusable. It's not the installer's fault, but he needs to at least come over and see if he can do anything and apply any manufacturer's interference mitigation tricks that he might be aware of (like Enphase's toroids). After a reasonable effort, it seems like the installer would have two options, remove the system and back out of the deal, or go to extra measures to fix the problem. I have a hard time expecting him to spend a lot of time at his own expense. But he should at least come over and make a good faith effort, and your installer should do the same. But I wouldn't feel bad if, in the end, he tried his best and I ended up having to spend some of my own time and money to fix it.
This sounds a lot like ordering satellite TV, and then after the install you find out that there is interference to the dish from something (like your ham radio) and it's unusable. It's not the installer's fault, but he needs to at least come over and see if he can do anything and apply any manufacturer's interference mitigation tricks that he might be aware of (like Enphase's toroids). After a reasonable effort, it seems like the installer would have two options, remove the system and back out of the deal, or go to extra measures to fix the problem. I have a hard time expecting him to spend a lot of time at his own expense. But he should at least come over and make a good faith effort, and your installer should do the same. But I wouldn't feel bad if, in the end, he tried his best and I ended up having to spend some of my own time and money to fix it.
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