Lack of fresh water

[Trojan]

I just ran into a crazy problem over the weekend. Using the city water connection. I find I have no cold water. All kinds of hot water. Turning on the holding tank water pump, I have have hot and cold water. Anyone else run into this. I know what the problem is. I have a blockage in the cold city supply. I just started tracing the water lines when I heard the cooler calling. I hope I have the plumbing drawings. This could take a while. This is going to be a pain finding the blockage and then more pain getting to it. I thought I might try a little air first, like 100 PSI of air.

BILL

 

[yachtsmanbill]

Sounds like the dock water pressure regulator! ws

 

[Trojan]

No bill it is not the regulator. The reg. also feeds the hot water tank and I have plenty of hot. Just no cold. Its not a hard fix. But I don't know where the cold lines run. I don't think there is anything in line that I can think of that would cause the stoppage. This is going to be interesting when I find it.

BILL

 

[Nonchalant1]

.............. Turning on the holding tank water pump, I have have hot and cold water. .........

BILL

Bill,

Try turning on the fresh water tank pump. That holding tank pump will give you something you don't want.

Actually, my dock water supply just is a T into the regular fresh water supply from the tank, after the pump, so it can not affect hot versus cold water. I either get hot and cold or neither. It seems like there would be very few places in your system that would do what you describe, since the cold water is the pressure feed into the hot water tank.

Doug

 

[captddis]

Low press can do that. I hate to suggest this but is it possible the hot water is from the dock plumbing being in the sun?

 

[Finalee]

The dock lines get hot here. There are times it takes several minutes to cool them off.

 

[Trojan]

When I use the fresh water holding tank and pump the water is fine. When I use the dock water the hot runs fine and the cold gives me nothing, Zero water. The cold water line is blocked completely. The problem is I am having trouble tracing the copper tubing. I'm going to have some help this week to trace the line. My 13 year old is still small and I'm going to stick him in the tight spots and trace the lines. I have no idea what is or could be blocking the flow. Most likely the fix will be easier than finding the blockage.

BILL

 

[Angela]

The dockside water comes into the system as just "fresh water" like your tank dispenses fresh water. On my boat the inlet for the dockside water is right where it meets up with the incoming tank water. There are no separate lines feeding hot/cold water from the dock versus the tank.

Where are you located? I'm in Florida. A welcomed cold shower in the afternoon after a day's work in the South Florida sun is not cold enough. It's just "warm", often uncomfortably warm, even with the faucet on "cold" only position.

I can't think of any way your dockside system can differenciate between cold and hot since it only supplies ambient water which then gets disbursed into hot/cold in the same manner as your tank provides water to the hot/cold sides.

Unless someone has done something extreme and quite strange (not to mention utterly expensive), I'm sure you'll find that your hot/cold lines run right back to the same place where your dockside water enters the boat.

 

[SKYCHENEY]

Could there be a valve in there for winterizing the hot water tank? Maybe the valve closes off the cold side so that antifreeze can be pumped into the hot side and maybe that valve got turned. Of course the fact that you have cold from the tank is a bit of a mystery. Just a thought.

 

[yachtsmanbill]

Just a brain fart Bill... Mine has a "bank" of check valves between the 2 freshwater pumps and dock water supply. There are actually 5(?) CVs in line.
Maybe one is stuck. Dont you usually use tank water? Give each one a rap while playing M.C.Hammer --- Make sure you put on the baggy pants first! Works for me ;-) ws

 

[Trojan]

Well I found the problem. There was a block in the line off the T that supplies both hot and cold. I had a union about 5ft from the T. After I had taken it apart there was no water flowing. I went out to the dock and presureized the system. When I returned to check, the water was flowing. I have no idea what it was that blocked it, but it works now. It must have blown out when I turned the dock water on. Alls well that ends well.

BILL