New owner of a 2005 Scamp 16 with shower. I'm having an issue where no hot water is coming out of the shower. No issues with hot water at the kitchen faucet. Pump does not activate when hot water shower dial is opened but will when cold shower dial is opened. I don't see a bypass valve of any type. Thinking it could be shower faucet issue but am hoping someone has been down this road before. Are clogs in lines a thing?