On Mon, 7 Jan 2019 06:25:00 -0800 (PST), wrote:

On Monday, January 7, 2019 at 9:15:20 AM UTC-5, trader_4 wrote:
On Sunday, January 6, 2019 at 11:14:07 PM UTC-5, TimT wrote:
If heater is turned to "on" from the "off" position, it works fine for the
initial warmup and turns off at the desired temperature. After that, it won't
restart automatically, it has to be turned off, then back on.

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for full context, visit https://www.homeownershub.com/mainte...y-1184357-.htm

Typical, from HomeMoaners. I have a boat, the engine won't start, what
do I do?

at least it is ON topic.
Would sure help tohave details - but THAT will never happen.
He OBVIOUSLY needs the thermostat replaced - and on most Chinese Crap
heaters the replacement parts are made of pure unobtanium and if you
could get them the cost of the part and the hassle of replacement is
worth more than the heater.

The Home Moaner OP is asking what he needs to do.

Very simple. Buy a BETTER heater - - -