Why is my shower's plumbing behaving like this?


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Old 06-22-16, 12:11 PM
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Why is my shower's plumbing behaving like this?

I had to disconnect my water heater because it was leaking and I was taking cold showers while I was working on getting a new one in.

When I was taking a cold shower, the shower would work. However, as soon as I turned the handle too far into the hot area, the water would stop flowing. Expected, since I had no hot water connected. What I don't understand is when I turned it back to cold water, it wouldn't work anymore. The only way I could get the shower to start flowing again was to turn on the hot and cold water on the sink next to it. That would "reset" the shower and it would start again. Why wouldn't the shower work unless I "reset" it with the sink and why would it even need that?

The shower and sink both share hot and cold water lines into the bathroom and are split with a T.

The hot and cold water lines on the water heater are capped as well.
 
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Old 06-23-16, 05:00 AM
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You probably have an anti scald type shower valve. Without water pressure one the hot side the balancing piston might be getting forced to one side and can't come back until the pressure is releived.
 
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Old 06-23-16, 03:16 PM
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Brilliant! You were right. Thanks!
 
 

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