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Aqua Tech

hi got a problem that is baffling me.

we put in a new regular boiler onto a y plan which has an old switchmaster set up. All seemed to go fine apart from a call three months later. When the heating and hot water are put on together the hot water becomes scalding?

Checked to see if it was 3 port valve but that seems to work fine, then tried a new cylinder stat and seem to still get the same problem...

THe only thing that has really changed is the wiring was moved around a slight bit because of the permenant pump live that was needed with the new boiler. Could this be the problem?

any ideas are welcomed...
 
wiring issue i presume, the 3 port allowing primary water to cylinder even when satisfied. check 3 port wiring, or could work properyly but the 3 port is passing, what type of 3 port, how old?
 
When you say you checked the 3 port what did you check as it could appear to operate but as fuzzy stated it could be passing
 
its a very old system master, that takes ages to click around...
 
i checked that when on heating only the pipes are not getting hot to the coil...
 
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