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potterton, s plan, system fault
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<blockquote data-quote="SPECIAL LOCATION" data-source="post: 201133" data-attributes="member: 250"><p>Other points for your consideration Meerkat....</p><p></p><p>Some less "quality" brands of valves have plastic housings....</p><p></p><p>these have small lugs that the valve return springs hook around...</p><p></p><p>I have know these small lugs to break off..</p><p></p><p>so the spring to manually pull the valve back to the "closed" position Doesn't!!</p><p></p><p>This can mean..</p><p></p><p>A) the valve is always open so when the other valve is on some water also flows through the jammed open valve!</p><p></p><p>B) the valve AND the micro switch are jammed on so it is always calling for heat and let's hot water go down that part of the circuit!</p><p></p><p>GuinnessGuinness</p></blockquote><p></p>
[QUOTE="SPECIAL LOCATION, post: 201133, member: 250"] Other points for your consideration Meerkat.... Some less "quality" brands of valves have plastic housings.... these have small lugs that the valve return springs hook around... I have know these small lugs to break off.. so the spring to manually pull the valve back to the "closed" position Doesn't!! This can mean.. A) the valve is always open so when the other valve is on some water also flows through the jammed open valve! B) the valve AND the micro switch are jammed on so it is always calling for heat and let's hot water go down that part of the circuit! GuinnessGuinness [/QUOTE]
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