Question about Water Heaters
My landlord recently replaced our emersion switch with a Grasslin timer. It heats the sink alright, but not the bath. When the tap is in the hot position the water pressure just disappears and it never heats up in either hot or cold position. I don't know if it's supposed to do this, but the water pressure won't work at times when the tabs are set to have the heating 'on'...
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Posted on Jan 02, 2017
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
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
It is most likely the water valve stuck open, telling the controls to heat water, that it thinks is flowing through it, but without actual flow it overheats. Depending on how comfortable you are with taking it apart yourself, you could open the valve to see if it just needs cleaned out, or if you have a ruptured diaphragm or some other cause.
Posted on Apr 22, 2009
most likely the diverter valve.. when hot tap turned on the movement of the water through the valve operates a diaphragm which pushes a pin/button//switch to tell the boiler to fire up
Posted on Sep 02, 2009
refere to manual check for override switch loss of pressure no problem re-pressurise and check for leak top of rad valve good place to start
Posted on Oct 11, 2009
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