Question about Water Heaters
Yes it is your expansion vessel it sounds under charged to me?your expansion vessel needs to be recharged to 1 bar at least,but check manufacturers instructions it could state different.if the heating is fine and your getting hot water in intervals your diverta valve is moving and working?
Posted on Dec 12, 2012
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Posted on Jan 02, 2017
got your fix, its a calcium buildup in the heat exchanger, and more than likely the rest of the unit, you will need to flush the unit with about 4 gallons of vinegar, you will need to recirculate it for about 20 mins through the unit, then flush with clean water, hook it back up, it might take a couple of mins for it to run properly, but it will, I have had the same problem with Rinnai on demand hot water systems, and it worked like a charm, check the filter thats inline as well, make sure it isnt plugged, clean if needed, also if you dont have a soft water system inplace, you might want to think about buying one and having it installed, that will reduce this from happening again for alot longer period of time, hope that helps
Posted on Jan 20, 2009
the problem is the diverter valve unit, source a corgi engineer to fit new one, cost for valve approx 80 quid +fitting
Posted on Dec 16, 2008
the problem was solved on my system by replacing thermostatic valve on shower and putting non return valves on hot and cold feed to shower . the problem was caused by cold water getting into the hot water line through the shower hope this helps
Posted on Dec 30, 2008
Can you please tell me the model of the vaillant, and the approx age?
I can solve this problem
I await your reply
Posted on Jul 16, 2009
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