Atwood water heater question

[Bob Geo]

Good Morning,
My Atwood water heater works fine when running off the water storage tank, however, when I hook up a hose for pressure water, the heater makes a continuous clicking noise (as though it is trying to ignite). Does anyone have any idea what the issue might be? Thanks in advance!!

 

[Parts guy]

How old is your Atwood? Dometic bought them out back in 2017 I believe.The clicking could be on the lp side (piezo trying to ignite) make sure you are switched off of propane. Otherwise I would look at getting a new control board…

 

[Bob Geo]

How old is your Atwood? Dometic bought them out back in 2017 I believe.The clicking could be on the lp side (piezo trying to ignite) make sure you are switched off of propane. Otherwise I would look at getting a new control board…

Thanks, its a 2015. My next thought was to replace the control board. I figured id pose the question here first.