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Shower goes hot and cold

We have a Mira Extra shower and a combi boiler. It has worked for years with no problems. We have a good hot water supply to bath basin kitchen sink and cloakroom hot taps but when showering it keeps going cold. Is it the shower if so what is it and how do we correct it.

Research, Knowledge and Information :

Shower runs hot, then cold, then hot. - Plumbing resolved ...

My shower runs hot, then cold, then hot again under certain circumstances. What would cause this? Details within.
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Shower Alternating Hot & Cold Water Randomly - Home ...

Shower Alternating Hot & Cold Water Randomly. ... a laundry being done just when you go to your shower. actions · 2007-Aug-20 6:24 pm · ninjatutle Premium
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Electric shower runs hot then cold - MyBuilder

Hi, My shower has recently started running hot and then cold. My husband normally has a shower first & he is fine! But then when I go for a shower after 5 mins the ...
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Hot and Cold Hydrotherapy – Showers - Health Free

Hot and Cold Hydrotherapy - Showers ... Why Hot and Cold Shower Therapy Works. ... As the outside temperature gets hot, the flow of circulation goes outward toward ...
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water in shower keeps going hot and cold - MoneySavingExpert ...

water in shower keeps going hot and cold In my home ... power showers pump the hot and cold through the system. ... How to make a tweet/Facebook post go viral ...
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shower: goes hot goes cold -

Ask your do it yourself plumbing questions and get free answers as well as DIY information about faucets, toilets, pumps and water filters from plumbers at
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I just took a shower and the water was hot, cold, hot, cold.

How JustAnswer Works: ... The kitchen sink is doing the same thing. When the water is running (as with in the shower) and it was going hot and cold, ...
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Shower going hot and cold | Triton Spares

Shower going hot and cold. First check that the main valve coming into your house is fully open. Then check all the valves on the line to the shower is fully open.
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Plumbing Issue - Shower Hot then Cold then Hot ... - City-Data

Jul 05, 2011 · Turn the shower on and let it warm up, hop in and not too long after the water starts getting colder until it's ice cold. I then turn off the shower
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Suggested Questions And Answer :

Moen single handled shower the hot water turns cooler then cold after a minute

Your whole house is likely plumbed wrong so that it is impossible to have equal pressures of both hot and cold at your shower. If you had your home plumbed with aquapex using a radiator for the hot water and a radiator for the cold water and have the radiators fed with a 1 inch line you can have close to perfect pressures.
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My shower only stays hot for a minute and then goes cold even though the hot water works everywhere else. I have a hot and cold tap and a third one to direct to shower or tub.

I would take a look at the stem replacement task. Maybe something is clogging the hot water flow, perhaps a damaged washer or debris
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One of my showers (witch is only 5 feet from the hot water heater) dosnt get hot and turns compleatly cold in less than 3 min, But the sink in the same bathroom gets really hot. The kitchen sink gets really hot as well as the upstairs shower and sink witch is locateded far from the HWH. The shower and bath faucet in question has a single nob that goes left for cold right for hot. Whats causing this and how do I go about fixing it?

Lets watch a video The hot and cold being reversed is an easy fix. When he took the handle off and exposed the cartage the small stem in the middle there are two flat spots on the stem with the screw hole in it just take some pliers and turn the stem 180% you don't have to turn the water off for this. DON'T TAKE THE KEEPER OUT FOR THIS! If cartage dosen't want to come out as mentioned in the video be ferm with it but don't get ruff. If the cartage was hard to get out it is a good idea to sand or clean the hole it came out of some very fine sand paper wraped around a pencel well do the trick. If you do sand use a squirt bottle and wash any debree out of the hole.
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Posi -temp shower fixture. Can't seem to regulate the hot water. When the hot tank rest over night its temperature goes down. So if you take a shower in the morning then only luke warm water at best. During when the hot water tank is used for other household applications ( more daytime use) the hot water has a higher temperature and you have turn the shower down (add cold water) or else it becomes too hot. So how can we regulate the shower temperature? I'm having the hot water tank inspected for its operation but is there other solutions we should be looking at? thanks for your advice-- liard_acres

That sounds like the thermocouple within the heater to me.There are 2 sections within the thermocouple.A reference section(what you want it to be) and an actual reading section.The difference between the 2 twists 2 pieces of metal which are different elements and causes a signal to activate/deactivate heater.It is simple but surprisingly accurate usually within 2 degrees F.Whatever is going on,it seems awful backwards.Checking the heater is definitely the best first choice.The shower hood is not likely to affect the system unless it had it's own heat or something.That is not the 'normal'function though.Also,after you do get it fixed,we have our water temperature set so that taking a shower requires very little cold water.Saves on water and power because hot hot water is only really needed if you have infants.Ours may be about 140F,150F,160F,don't remember exact and it's hard to access.Set a temp and let sit 24 hours and try it after it's fixed.Probably adjust in about 10 or 15 degree increments,depending how far off it feels compared to what is tolerable.Good luck,Greg If you have any questions or need more help,just comment here and I will get an autolink to your post and reply ASAP.Greg
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Hot and cold water in shower comes out in a triclkle

Shut off the water from the main pipe. use a allen screw driver take the handle off the shower control. pull of the wall cover. pull out the pin that stablized the cartridge in the control body. (remember how it is, before you take it out. or take a digital pic of it). pull out the cartridge. and bring it to any home center or plumbing store. install in reverse.
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