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Old 12-31-2014, 06:31 PM   #16
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Quote:
Originally Posted by TheEplumber
How is the water delivered to the house- well, city, or something else?
Do you know the delivery pressure?
@TheEplumber: The water is city-delivered. Not sure what the pressure is but normal flow is adequate for all of our uses. Most of the shower heads originally had low-flow heads - two (both in the upstairs bath) have been replaced with standard-flow.

Quote:
Originally Posted by Homerepairguy
At your water heater, how are the lines branched to go upstairs and to the downstairs bathroom with the problem? Is there something in the hot water line to the downstairs bathroom (heat trap valve)?
@Homerepairguy: I can't really see how the pipe routing works as it exits out of the hot water tank and immediately into the wall with no obvious divergence for upstairs vs downstairs. Also, after a little more tinkering I think the "filling the upstairs tub" as a cause may be are herring as my son has told me he experienced this one trip when nobody was using the upstairs at all.

Quote:
Originally Posted by Ghostmaker
Is this some sort of gravity based water supply?
@Ghostmaker: How would I know if it is pressurized vs gravity?

Last edited by ccoulson; 12-31-2014 at 06:36 PM.
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Old 12-31-2014, 06:55 PM   #17
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If I was to take a wild guess I would say that the shower having a problem has a pressure equalizing valve installed on it and you are either loosing hot or cold water pressure at that valve and the valve is compensating for the drop in pressure and its sticking in the closed position

This is normally on a single handle valve, If you remove the cover look and see if there is a nut on the valve around 1 in, the control is behind it.

Post a picture of the valve or give us a model and brand name
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Old 12-31-2014, 06:58 PM   #18
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@Jnass2: Would this also affect the sinks in the same bath?
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Old 12-31-2014, 07:58 PM   #19
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This is a Moen shower/tub faucet set.
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Airlock in one bathroom on same level as hot water tanks-img_1687.jpg  
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Old 12-31-2014, 08:10 PM   #20
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Moen cartridges can fail and cause a cross connection between hot and cold. Replace them.
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Old 12-31-2014, 08:22 PM   #21
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Moen cartridges can fail and cause a cross connection between hot and cold. Replace them.
Thanks Ghostmaker. Do you suggest replacing all of the cartridges (inncluding the sinks) or just the tub/shower valve?
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Old 12-31-2014, 08:42 PM   #22
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Quote:
Originally Posted by ccoulson View Post
Sorry - maybe I am using a British term which would explain why most of my search results are coming from .uk sites.

When I say "air lock" I am referring to something (air?) blocking hot water from reaching this particular bathroom. When I open the hot water taps, nothing comes out. Cold water is fine and all other faucets in the house are delivering hot and cold water fine. What is the proper US term for this?

Most of the (uk) help sites I have found suggest connecting the cold water hose from the washer to the the hot water connection to force the air back into the hot water system and thus relieving the air lock and allowing hot water to flow normally. But, in my case, the washer is on the upper level and affected.

Thanks.
I dont see how changing a moen cartridge will fix this. Once a domestic water line is purged of air there is no way air will re-enter unless it back siphons.
Can you list all your fixture please?
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Old 01-01-2015, 09:09 AM   #23
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The sinks you can isolate by shutting off the hot underneath. If problem gos away you found your leaky cartridge.

You also may have shut offs on that shower valve you can remove the plate and see if screw driver stops are there. Do One at a time

Moen will replace them free.
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Old 01-01-2015, 10:02 AM   #24
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I've seen this happen a couple times in years past with the old solar water heaters its called thermal lock but only on the old thermal siphon solar water heaters
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Old 01-01-2015, 01:15 PM   #25
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Quote:
Can you list all your fixture please?
@Eplumber: The problem bathroom has the Moen single handle tub/shower faucet set and two sinks each with dual-handle Moen faucets.

Quote:
The sinks you can isolate by shutting off the hot underneath. If problem gos away you found your leaky cartridge.
@Ghostmaker: I closed the two hot water stopcocks on both sinks and opened the tub/shower valve to hot - nothing.

Quote:
I've seen this happen a couple times in years past with the old solar water heaters its called thermal lock but only on the old thermal siphon solar water heaters
@Javiles: No solar system involved here.
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Old 01-01-2015, 01:28 PM   #26
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Quote:
Originally Posted by ccoulson View Post
@Eplumber: The problem bathroom has the Moen single handle tub/shower faucet set and two sinks each with dual-handle Moen faucets.


@Ghostmaker: I closed the two hot water stopcocks on both sinks and opened the tub/shower valve to hot - nothing.


@Javiles: No solar system involved here.
I meant all the fixtures in your house, particularly the types of faucets.

Are you saying that you get nothing from the hot side- no water at all?
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Old 01-01-2015, 02:03 PM   #27
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Sounds like a blockage somewhere in the line feeding the bathroom. No cartridge I've ever seen would/could kill the water to nearby fixtures due to failure. If I'm guessing, I'd bet there is a isolation valve to the bathroom that is getting plugged with something when a faucet is opened. If left alone the debris probably settles and allows water through for a period of time.
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Old 01-01-2015, 02:44 PM   #28
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If the problem is in the tub with the MOEN then service the MOEN. I think you will find your problem there.
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Old 01-01-2015, 03:50 PM   #29
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Quote:
Originally Posted by TheEplumber View Post
I meant all the fixtures in your house, particularly the types of faucets.

Are you saying that you get nothing from the hot side- no water at all?
@Eplumber: ok, here is an inventory of fixtures

Bottom Level:
- Dual hot water tanks, daisy-chained
- Bathroom with Moen shower/tub faucet and two sinks, each with Moen dual-handle faucets. NONE of these three fixtures are delivering hot water. When the hot water handle is open, NOTHING comes out. Occasionally, there will be a slight hiss of air - but NO water at all. Cold water works as it should.

Upper level:
- Laundry
- Kitchen sink with Price-Pfister single handle faucet
- Dishwasher
- Half bath with toilet and sink with dual handle Moen faucet
- Master bath with toilet, dual shower with TWO Moen single handle faucets, two sinks each with Moen dual-handle faucets, tub with Moen dual handle faucet
ALL fixtures on this level deliver hot and cold water as expected.
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Old 01-01-2015, 04:48 PM   #30
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[QUOTE=ccoulson;1559529]
Quote:
- Dual hot water tanks, daisy-chained
By daisy chained - you mean plumbed in series or parallel? Can you post a couple pictures of how the dual hwh's are plumbed. Thanks.

Maybe one of the tanks is bad or going bad. Just a thought. About how old are the tanks? Please excuse me if this was already mentioned.

Last edited by jmon; 01-01-2015 at 04:59 PM.
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