you cant expect a company to warranty something that has been modified with parts that are not oem parts, if that part modifies the way the appliance operates, especially, if its an intergral part, like a circuit board, i would consider that a modificati0on. i would have to ask norcold if they would warranty it.
this is where lawyers come in.
its NOT up to the service tech to make a decision whether that part is covered under warranty. thats up to norcold to say yes or no.
what happens if there is a major failure, and a coach is lost, or worse, an owner is injured because of that part failing. if the tech made that decision, to use a non oem part while the appliance was under warranty, he would be involved in the blame for the damage. LIABILITY is the key concern of everyone involved.
that said, if its a fan that meets oem specs, that should not alter the warranty. i would still get oem approval.
its like when you replace a chip in the computer on a car engine, or use non oem oil in your engine. if it meets oem specs, there is some wiggle room for liability blame.
when you use sob parts, they have to meet oem specs. and you should get oem permission, in writing, to use the sob part.
its sad to say, but legal liability is a major part of any decision to repair a coach, and which parts are used.
ive been involved in a couple of cases, where my own company was blamed for damage to a coach, but because i used due diligence in documenting both the oem responce, and the repair procedure, the mediator held us blameless.
its sad when you have to worry about such things, as well as doing a good job, but thats the way things are now.