Yes. Whichever is filling slow. Hot or cold. It is a code for the fill valve. Just replaced the cold fill valve on my unit which seems to be the one that most commonly goes out. Easy repair. 2 screws and 1 Plug...If you unscrew the top by taking out two phillips screws in the back, you will find some paperwork about trouble codes, repairs etc...Right next to the fill valves.
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