Shower always hot or no cold pressure

Question

Hi There, i have currently have two showers and recently the one upstairs has stopped providing cold water and is luke warm or goes really hot but when i turn it to cold it stops providing water pressure 

(could this be related to the Thermostatic mixing valve?)


The 2nd issue when i use the downstairs shower it is really hot and stays hot the same tempature no mater which way i turn it hot or cold?
any idea what the issue can be?

Please note i have a baxi boiler and a have a main indirect cyclinder 250 litre.

Hassan · Accepted Answer

If you have no issues of hot water on taps, then the problem will be on the showers blending valves

Abdul · Answer

Possible reasons your shower might always be hot or cold:

Faulty mixing valve:

This is the most common culprit, where the internal mechanism responsible for mixing hot and cold water is malfunctioning.

Blocked shower head or filters:

Debris buildup in the shower head or inlet filters can restrict water flow and affect temperature control.

Low hot water supply:

If your water heater isn't producing enough hot water, your shower might always lean towards the cold side, especially if multiple people are using hot water at once.

Damaged or worn-out parts:

Over time, the seals and components within the shower valve can wear down, causing temperature inconsistencies.

Improperly set hot water heater temperature:

Check your water heater settings to ensure the temperature is set to a suitable level.

Andrew · Answer

It definitely sounds like a thermostat cartridge problem to me

Benjamin · Answer

Yeah think you’re right if you have bar mixer showers it may be that they need replacing. There may also be a leak on your cold water feed but assuming it’s only the showers that aren’t going cold ie mixing I would go with the first.

Vinny · Answer

Sounds like the thermostat mixer in your shower needs cleaning/changing.

Kai · Answer

I would agree with your mixing valve being at fault here if it only at the shower and not other hot water appliances

Paul · Answer

This sounds like thermostatic mixer has failed but depending on how it is piped it could be an imbalance in pressure between the hot and cold supply.

Rodrigo · Answer

Hi
you are not getting enough pressure, you may need to increase the pipe size or add a pump.

Shower always hot or no cold pressure

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