New Danby dishwasher - no water flowing into it

Water pipes in RV are Pex, which is not the same as PVC. Pex will freeze, but is designed to not burst when frozen. If you have located the broken pipe, it is simple to replace. Using a PVC cutter (looks like cheap shears) cut out the broken piece. Most likely the pipe size will be 1/2 inch. Pex comes in three different colors: white, red, and blue. Most likely the RV pipe will be white, but the color does not matter as the pipe is of the same material. Pex can be bought at stores like Home Depot, Lowes, or other hardware stores. The connector fittings can be bought at the same stores. The simplest to use fittings are the push-on self sealing fittings. There are cheaper fittings, but they take special tools to install them. The estimated cost of a 2 foot distance pipe repair is about $10 to $15. The time required depends on how difficult it is to "get to" the broken pipe.

Probably heat trap nipples, or other constriction in pipes.
http://waterheatertimer.org/New-water-heater-making-noise.html
http://www.thetankatwaterheaterrescue.com/forums/forum3/
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try using the services of an electrician when fitting electrical components
the thermostats only stop/ start electrical power to the elements and will not control the temp of solar systems
if they physically burn the points , there must be an electrical short of some sort so an electrician in to test circuitry is in order

1) Test elements, and if elements check out, then replace both thermostats.
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html#new
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html#warranty

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This is just what I would say for an average family of four during hours of peak usage. You should be okay with a flow rate of twenty to twenty four lpm,assuming you have rapid enough recovery. This is based on one shower at a time and not running dishwasher or clothes washer at the same time.If you are using hot water from multiple fixtures then increase accordingly.Hope this helps. Thanks

Hi and welcome to Fixya.

Here are 2 manuals that should help you in troubleshooting your RV hot water problem.

Multiple times there is a ref. to resetting the reset switch for 30 seconds on the unit (cover removal required)

For the ignition:

http://www.atwoodmobile.com/manuals/waterheaters/MPD%2093757%20PS%2011.19.07.pdf

For the water heater:

http://www.atwoodmobile.com/manuals/waterheaters/MPD%2093050%20PS%204.9.09.pdf

The manuals as written are full of warnings mixed in with meaningful text. (Not user friendly)

If your thermal expansion tank is older than three years, it is probably time to replace it. There is a diaphragm inside the tank that goes bad over time. Before replacing this tank, if you have recently purchased a new washing machine, this may be the problem if it does not have hammer arrestors on it as well.