This YouTube video (creator: Derek Cole; uploaded by Derek Cole) addresses whether DIY maintenance can void an extended parts-and-labor warranty. The speaker explains that many extended warranties stipulate professional contractor maintenance twice a year and that failure to have contractor service — or to retain proof — could jeopardize warranty coverage even years later.
If you do do it yourself and you have an extended warranty, it could affect the stipulation for extended parts and labor warranty is that you have to get a professional contractor twice a year to service and maintain your system. So if you don't have that done by a contractor, you know, where's your proof at? Now, sometimes they ask, sometimes they don't ask. But if that question were to come five years down the road and say, hey, have they done maintenance on the system?
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