He said, "Once I shut off the taps, the system slowly loses pressure and drops to zero and throws an error code.I know that if a prv has gone bad, it will show the symptoms you are describing, (strong pressure at first then no pressure at all) you can check it by putting a gauge on it and running water on the tub )IT SHOULD NOT DROP more then 5 psi if so try replacing the prv
You should try to find if the company had authorized service reps. I other words, a person familiar with the system, that can trouble shoot it.Thanks so much. I had one person tell me 15-20 psi. Does that sound correct?
Ill have to buy a gauge.
I would love to be able to contact the manufacturer but they went out of business and completely shut their doors and all support. Now i'm stuck with a problem that only the kind internet folks might be able to help with.
Most plumbers i've talked to don't have a clue unfortunately and just quote me 5-6k for a new one right away.
In the meantime...
For the purpose of discussion...
There are 4 vertical water pipes entering the bottom of the unit.
I'll refer to them as numbers 1 thru 4 with #1 being on the far left.
#1 & #4 are the heating system lines.
#1 has a pressure gauge that appears to be reading(in the green zone) at about 26 psi. It also has a red hose that comes from the furnace. Just above that line, within the box appears to be a Grundfos circulator. I suspect, if you look closely, this line connects to what I assume to be the expansion tank just above it. If this is true then we can say this is the expansion tank for the heating loop, which should have no impact on the domestic hot water system.
Line #2 is the cold domestic water line, which feeds both the tankless unit as well as line #4(heating system loop), thru a backflow preventer and PRV with integral pressure gauge. Although I can't read it, I would think this gauge would be reading the same static pressure as the gauge on line #1, being on the same loop.
Line #4 shows a red hose that I'm guessing runs back to the furnace. However, there's a vertical white line that appears to have a red hose attached to it also. I can't see what's happing there. Is there a tee connection there, or what? And where does that white hose go when it drops down?
Also what's troubling me is that #3 line which should be the hot domestic water coming out of the unit. I can't see what it is doing behind that backflow preventer. It almost looks like that horizontal cold water line could be connected to it.???
How exactly do you, "pressure up the system..."?
And when you say, "It will hold pressure while the hot water is running. .....Once I shut off the taps, the system slowly loses pressure and drops to zero and throws an error code." Are you looking at the units electronic controls/readout???
You should try to find if the company had authorized service reps. I other words, a person familiar with the system, that can trouble shoot it.
BTW...What was the error code? I've been doing a little research and although I can't find this specific unit I have found that the error codes are pretty much the same for most manufacturers.
Well great to hear the good news!
I laughed out loud when I read your comment regarding the parts company was the same company that wanted to rip you off.
It is a complicated system and I wouldn't expect the average plumber to know all the ins and outs.
Well the error code doesn't correspond to any of the ones I came across on some YouTube videos. I'd take a long shot in the dark and say the pressure was too high and shutting it down.
Thanks for clearing up the mystery on why that cold water line looked like it was connected to the hot water line. I should have known it was a tempering valve. Particularly since I just replaced my tempering valve a few days ago, on an oil burner fired heating boiler. Never dawned on me that those systems used them.
I'm not very knowledgeable as far as hands on plumbing experience. I dabbled in plumbing engineering and like puzzles and researching. They say learning new things everyday wards off dementia.
Good luck with your tankless!
Oh yeah, I forgot about that. Others may know best but I did notice a lot of videos addressing that subject. I didn't watch them though. YouTube is a valuable resource.Thanks! diehard. I knew NOTHING about plumbing before a week ago. I’m a mechanic so I pick up quickly but this stuff can be complicated, especially when the plumbers don’t even know how they work. Haha!!
Keeping the brain active is key!
Thanks for all the help.
On a side note.
If anybody knows the proper way to descale these things please let me know!
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