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I HAVE A GROHTHERM WIRELESS HIGH PRESSURE SHOWER WHICH RUNS OFF MY COMBI BOILER SYSTEM AND WHEN THE WATER REACHES THE DESIERD TEMPRATURE IT RUNS OK FOR A WHILE THEN IT SUDDENLY RUNS COLD AND U HAVE TO WAIT 10 OR 15 SECONDS FOR IT TO HEAT BACK UP??? WHY.
ITsounds like you still have air in your lines try bleeding lines out some times it takes a while .or your getting air in lines some where try looking at the boiler at fittings .
Posted on Feb 21, 2009
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Posted on Jan 02, 2017
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