Electric shower problem

[leepail]

Hi everyone, not sure if you can help but I have an electric shower problem which has had me scratching my head a little, the shower won't work until the hot water tap in the bath is turned on, the shower has no hot feed, just cold, direct from the mains, and it's a gravity hot water system, so I'm stuck as to why one is affecting the other.
Any ideas?
Thanks in advance

 

[Plumbstar Tom]

Hi There

This is strange

Electric showers should have the feed directly from the mains, not interferring with any plumbing system

What make and model is the shower?

 

[johnmcginty]

This is a pressure problem most likely if you say the feed is definately from the cold supply. Check the stopcock is fully open, have you done a pressure reading? have you been there more than once at different times of the day?

 

[leepail]

Just been round and it's not an electric after all, its a mira event xs thermostatic. Sorry for any confusion. I had a quick look under the bath to see if there was anything obvious, the speedfit tees weren't tight which i suppose might cause a little air to get in? So I've tightened them and I'll be back round in the morning to see if it's made any difference. Any ideas?

 

[Plumbstar Tom]

So is the shower teed in off the bath?

Does it not need a direct feed?

I would check that the required head is on site

Was half rattling my brain last night trying to figure it out on an Electric shower lol

 

[Puddle]

Well is shower/bath pumped ,then could be faulty cold water flow switch on pump,pump only operating on hot flow switch side

 

[Plumbstar Tom]

Puddle

The shower is a power shower so has an integeral pump

No flow switches

 

[leepail]

Sorry for the confusion Tom. The shower is a thermostatic mixer with a built in pump, according to the Mira website. It looks like an electric shower though. I can only see a hot feed under the bath, teed in from the hot tap, I can't see a cold but it must be under there somewhere, otherwise the shower would just be hot wouldn't it?

 

[Plumbstar Tom]

Yeah it will have a mxier with hot and cold feeds and I think a single impeller pump thats pumps the mixed water. Im pretty sure that the problem is teeing the hot from the bath, i have a feeling that turn the hot water bath tap on jump starts the showers hot feed. It should have been a direct feed from the HW cylinder Can you turn the temp all the way to cold and try it? Is this a new install?

http://www.mirashowers.co.uk/onlinecatalog/pdf/p3783_4.pdf

See the above I have found on Mira website

Feeds need to be direct

 

[leepail]

Well tightening up the speedfits seems to have done the trick. I'll leave it for the customer to try for a few days and if the problem persists I guess I'll have to fit a feed from cylinder, as at should have been in the first place.
Thanks for your help guys, much appreciated.

 

[NickH]

I've seen a few of these type of showers fitted with feeds taken off the bath supplies and they all seem to work OK.