intermittent loss of hot water from shower mixer

Postby catjc » Mon Oct 04, 2010 3:39 pm

I have a shower with a thermostatic mixer valve that is fed off a combi boiler. When it is working properly, it can get very hot. Intermittently - for a period of a few days to a week - it only gets to a temperature that is best described as on the cold side of tepid. The pressure is unaffected. The problem is not related to use of water elsewhere in the house.

I'm wondering whether this could be caused by limescale somewhere in the shower mixer causing something to stick and what can be done about it. We do get bits of limescale showing on the shower head, but it's not blocked.

Any advice?

Posts: 2
Joined: Mon Oct 04, 2010 3:34 pm


Simply Build It

Postby RachetHammer » Wed Nov 24, 2010 4:58 pm

Pump it with limescale remover.
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Joined: Wed Nov 24, 2010 2:53 pm

Postby catjc » Thu Nov 25, 2010 5:08 pm

Thanks for the suggestion. How do you get the limescale remover into the shower unit? I don't have a hot water tank so can't put anything in that way. Could I turn off the mains water, drain the pipes and then push in through the shower hose using sealant gun as a pump?
Posts: 2
Joined: Mon Oct 04, 2010 3:34 pm

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