Help! No hot water.

Waiting for OP to post what the problem was (patiently rapping fingers on desk). :D

Have you run the pump recently? For some reason, our hot water heater won't heat all the way or at all if you've run the pump since running the hot water and getting any air out of the lines.

Cocky_Camper wrote:
If the water heater has not been lit since you got there, it could possibly be air in the line. You may need to bleed the water heater line.

This would be the first thing I would check. OP has a 2016 and maybe this is new to him? I assume the HWT switch inside is turned on...

By the looks of pics you have an Atwood WH

Backside of water heater:
Check that valving is set up for WH use
Cold inlet valve OPEN/Bypass valve Closed/Hot outlet valve OPEN (unless mfg. only used check valve in hot out)

Water supply ON..open closest faucet hotside and bleed all air out (might take awhile cause WH needs to fill)

With WH Tank full.......
Turn Propane Switch ON
Listen/check for spark and main flame----might take a few tries to establish propane flow (if more then 3 then WH may 'lock out' and turn on 'Fault Light' (RED Light at on/off panel) To Reset----turn Switch OFF, wait 30 seconds turn back ON

IF that doesn't work......
Then you will need to test for DC at the Brown Wire coming from circuit board going to 'thermal fuse' (device inside clear tubing) to terminal on T-stat

****Have to test when trying to first light off---before it 'locks out'

Are you trying to run the WH on gas, or on electric?

Most people use electric when on full hookups, since you're already paying for the site and that saves your propane.

If you are trying to use propane, then light a stove burner and let the propane flow to it for a minute or so, to clear any air from the lines. Then the fridge burner may light correctly.

One that bites people once in a while is leaving the inside or outside shower faucet handles on, and shutting the flow of water off at the shower head. Check to make sure that all the shower faucet handles are shut off.

If it's first time you've used it it could be bypassed from winterizing. The the valve near your tank on the inside of your trailer. If this is the case you may have destroyed your electric element.

Been nice if you told us more about the water heater. While many may have your water heater model few have you RV model.

Have you checked all your electric lines going to it.
Last year when we got tot the camp ground one of the 12 volt lines had come undone just enough so it looked like it was connected but was not and wouldn't fire up.

If the water heater has not been lit since you got there, it could possibly be air in the line. You may need to bleed the water heater line.