Manufacturer's instructions represent the basis of local codes, the foundation of warrantee and insurance. Manufacturer's instructions include: "Installer must be a trained, experienced service technician." It is best to follow the manufacturer's instructions to the letter; which are usually to the effect of calling a repair company authorized by the manufacturer and/or the utility. Manufacturer's instructions that accompany the product tell what a DIY can do and what is recommended to be done by a certified tech. No intelligent technician can advise against following such instructions and expect to stay in business; therefore you can identify a dangerous, inexperienced guesser by advice that ignores manufacturer's instructions and diverts you away from those instructions.
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