I purchased a new Model 3800 D from Tom Johnson RV last July and I have had problems with the hot water in the shower. When I turn the knob to increase the flow of hot water to the shower head the volume and pressure diminishes to the point that I don't even have any water at all. Does anyone else have any ideas about this problem? I have talked to Tom Johnson reps and I have also talked to Coach net with no results. Please share any ideas you might have.
Lucky Mike said
11:11 PM Dec 5, 2012
do you have pressure with just the hot water on?..........I would check water filter system for dirty filters.....and would temporally bypass or remove the house water pressure regulator and see if that cures it...............sounds like you have low water pressure
bensnugs said
11:40 PM Dec 5, 2012
Hi Mike,
I have great pressure on the cold water side but when I turn toward cold the pressure becomes less and less until I have no pressure when it approaches full hot water volume
Lucky Mike said
11:53 PM Dec 5, 2012
If this is a single valve unit with only one knob ........your mixer inside the valve is possibly obstructed.....or the hot water shut off for the shower is obstructed..........if it is a single knob type ....if you could give me the brand name off the knob I can walk you thru the repair..............should be a delta or symmons type
Lucky Mike said
12:03 AM Dec 6, 2012
Just had a brain fart!!!.........if you remove the knob you should be able to remove the backplate......once you do that the mixing manifold will be exsposed......either on the hot water side your left hand......or in the center will be a screw adjustment turn it all the way in and test......then back it out and test........this is the anti-scald adjustment
if you have been having this problem since new , the valve was never adjusted out of the box because they dont wet test in the factory........they test for leaks with air!!!.
bensnugs said
05:32 PM Dec 6, 2012
Thanks Lucky Mike ---I'll go over this afternoon and try this.
I purchased a new Model 3800 D from Tom Johnson RV last July and I have had problems with the hot water in the shower. When I turn the knob to increase the flow of hot water to the shower head the volume and pressure diminishes to the point that I don't even have any water at all. Does anyone else have any ideas about this problem? I have talked to Tom Johnson reps and I have also talked to Coach net with no results. Please share any ideas you might have.
Hi Mike,
I have great pressure on the cold water side but when I turn toward cold the pressure becomes less and less until I have no pressure when it approaches full hot water volume
if you have been having this problem since new , the valve was never adjusted out of the box because they dont wet test in the factory........they test for leaks with air!!!.