Your MH is different than mine (I have valves, no switches that light up) but that antifreeze is going somewhere. Yes, I would think "Bypass" would skip the WH.
I would check to make sure that; your low point drains are not open (don't know if you've even opened them if you blew the system out), you've capped the air chuck inlet and the park water connection is off, the WH is not filling and open maybe just one faucet or tap at a time. In my MH, pushing air out and trying to fill empty lines just might take four gallons. I dunno. You'll have to start eliminating possibilities.
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