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Discuss Shower Cold, plumbers clueless in the Plumbing Forum area at PlumbersForums.net

AWK

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shower cold unless hot sink or bath tap turned on for a few seconds.
shower then remains hot for about a minute then goes cold.
Original shower Mira minilite evs, replaced with an Aqalissa bar type..
still same problem. Using a megaflow unvented system with mains cold direct to shower, spoke to a plumber on phone... he aint got a clue..HELP.
 

CBW1982

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I would say possibly cold forcing hot out of the way or maybe even the valve has been fitted incorrectly as in reversed supplies.
 
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AWK

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Hot left. Same problem with new shower!!!
 
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May be that the unvented cylinder pipework hasn't been done correctly regarding the balanced cold supply.
I'd recommend getting g3 cert engineer to check it out.
 
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AWK

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been working fine for 20 yrs, problem started about 3 weeks ago.
 

Riley

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Then something has changed have you removed the shower and run the water is it a noticeably different flow from H&C??
Are you getting ok hot at all other outlets
 

townfanjon

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If you have any mixer taps anywhere and they have isolation valves , turn them off , failing that you might have to fit some
 
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AWK

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all taps ok only the shower has problems, could Anglia water have changed the incoming pressure from somewhere out there???
 

Riley

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Would affect your other taps then wouldn’t it.
 

Riley

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Your mains SHOULD come to a combi block next to the unvented cylinder and be balanced so you get equal h & c everywhere. Is your kitchen tap a mixer?
 

CBW1982

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been working fine for 20 yrs, problem started about 3 weeks ago.
I’m not picking, but that would have been helpful from the start, moving on... what has changed plumbing wise in the last 3 weeks? Or have you had any work carried out?
 
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AWK

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yes kitchen tap is a mixer. nb before fitting new shower I purged the lines and the cold had a lot more pressure than the hot.
 
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the only work that was done prior to all this was a radiator drain cock replaced,
 

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