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Old 01-21-2020, 05:15 PM   #1
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THOR #14923
Hot/cold water reversal

Sooo,

Iíve attempted to diagnose this problem still without success. My ACE 27.2, when plugged into city water, reverses the hot and cold on all faucets, including the outdoor shower. The toilet flushes hot water. When using the water tank, no city water hookup, it is normal. All connections I can see (under the sink, bypass valves, outdoor shower, etc.) are correct. Reversing the outdoor shower as suggested did nothing. Thor sent me a plumbing diagram, but otherwise was no help. Obviously something was reversed at the factory. I bought it used (as a 2018 with 5000 miles)and doubt the original owner even noticed it. On the IRV forum, someone had a similar problem, and found a reversed line under the indoor shower. (He had to cut out the floor, etc.) Itís not important enough to start cutting holes everywhere to find it, but if there is a solution please let me know. The MH has been great otherwise. Thx.
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Old 01-21-2020, 07:07 PM   #2
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If your not physically changing a valve when hooking up the city water connection, this isn't possible

Many have had the outdoor shower valves on and the head shut off and had issues with hot water but that isn't you problem

check the pex from the city connection to where the pump discharge line meets and you have your answer
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Old 01-22-2020, 12:00 AM   #3
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Iím not sure what you mean by the ďpump discharge line.Ē Are you referring to the output line from the water pump?

I assure you whatís happening is possible. Water pump off, city water on results in reversed hot/cold and hot water in the toilet. City water disconnected, water pump on, results in the opposite, cold water in the toilet, faucets functioning normally. No valves were turned.
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Old 01-22-2020, 12:08 AM   #4
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THOR #6903
There is a check valve that should prevent hot water from flowing backwards through the hot water heater

Yes check the line from the water pump and from the city connection

See where they intersect and check the valves

The connection should be in the wet bay and in fairly close proximity to each
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Old 01-22-2020, 12:21 AM   #5
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Iíve followed the line from the city water to the water heater (access under the sink, which is in the slide) and it goes up to the kitchen cold water faucet and into the hot water heater appropriately. The bypass valve on the water heater is closed. Lines from the heater and city water go under the floor, which I have no access to, to my knowledge.

Iím not sure what you mean by the ďwet bay.Ē

Thx
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Old 01-22-2020, 12:28 AM   #6
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THOR #13932
I know you've experimented and thought this through but I have to ask:
Do they actually 'reverse' or do both lines go hot?
Both lines hot I can diagram out.
Reverse I can't.

A little more information please.
Is the hot the same temperature on house and city water?
Is the cold the same temp on house and city water?
What's the shore pressure?
Whats the pump pressure (just a guess is OK.)

What happens when you're on shore water AND have your pump on?
Does your shore hookup fill the house tank or is it gravity fill?
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Old 01-22-2020, 01:46 AM   #7
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THOR #14923
Yes, the temps are the same on either city or tank. Hot is hot, cold is cold.

I donít know the pressures, but I did put a pressure reducer on the city water fill side with no change.

Itís in storage now, I will check with pump on and city water on, but I think it has defaulted to city water and was reversed. Thx for the ideas. Will report back.
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Old 01-22-2020, 02:41 AM   #8
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Would this diagram help?
I found it online somewhere.
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Old 01-22-2020, 02:51 AM   #9
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Quote:
Originally Posted by richguess View Post
Iíve followed the line from the city water to the water heater (access under the sink, which is in the slide) and it goes up to the kitchen cold water faucet and into the hot water heater appropriately. The bypass valve on the water heater is closed. Lines from the heater and city water go under the floor, which I have no access to, to my knowledge.

Iím not sure what you mean by the ďwet bay.Ē

Thx
Serious face now...The only way I can see your problem happening is if the city line is tapped into the Hot line. If it was:
  • Turn on Hot tap, cold (city) water comes out
  • Turn on Cold tap/toilet, (city) water runs into HWT backwards (top, hot side) and pushes Hot water out the bottom to the Cold water lines
Make sense what I said?
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Old 01-22-2020, 04:41 AM   #10
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The initial diagram looks like the way I feel. When I get up to storage Iíll look at it an post a pic. I agree it seems like itís somehow a back flow issue. Thx for the thoughts.

Rich
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Old 01-22-2020, 12:45 PM   #11
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Sketch the city line to where it connects to the discharge side of the water pump

That will tell you where the problem is

You have a cross connection some place

Wet bay is where you're water and sewer hook ups are typically located
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Old 01-22-2020, 01:45 PM   #12
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Also check outside shower...if both knobs are "on" and the "quick stop" button on the shower head is in the "off" position, it will allow a mix of hot and cold to back feed into whichever line is opened somewhere else. Probability is low on this one but you gotta check everything.
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Old 02-01-2020, 11:20 PM   #13
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Hello richguess...

Curious minds would like to know how you made out with this.
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