Boiler Upgrade but leaking shower box

t45

hi there,
i have recently replaced an old gravity fed boiler system with a combi boiler.
After a leak on a small pipe running from my sink basin ( i think caused by the increase in pressure from new combi - it's an old property with old pipes - this was repaired by a plumber) I have now found that the shower box that is attached to my bathrrom wall (which we no longer use as we have sufficent power pressure in our bath tap mixer) is now leaking with drips -
it's really bizzare because I assumed that now we have a combi we would lose the shower that we used to use -
i have not dared to try it (which is silly) .....but even it it is still active or not it shouldnt be dripping I would assume.....
any advice for drips from shower box - it's not the head of the shower but the box where you turn the dial - i assumed this was all connected to the old system and had been disengaged.....

missile

Sounds like you may have a leaking seal. Should be easy to fix.

nofoollikeold

1. If your old shower is electric, with a single (cold) feed, it should have been on mains pressure anyway, so installing a combi should have made no difference.

2. If your old shower is electric with both hot and cold feeds, then it is likely to have been fed cold from the cistern in the loft and hot from the cylinder in the airing cupboard. Both are low pressure feeds and it is quite likely that changing to a combi will have resulted in high pressure in both. They are not designed for high pressure and very likely to leak. The remedy is to remove the unit (after isolating water and electricity) and cap both pipes. Often the casing can be put back for aesthetics.

3. If your old shower is not electric, then it will be designed for low pressure (as in 2.), perhaps augmented by a pump. Again, quite likely to leak at high pressure, and same remedy as 2. above.