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You can have air in the lines which allows water to pass. This could be pushed out with a strong surge of fluid,<div>or be absorbed in the water over time. A flow too low to activate a heater sounds pretty low.<br><div> <span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div>Clarke Olsen</div><div>373 route 203</div><div>Spencertown, NY 12165 </div><div>USA</div><div>518-392-4640</div><div><a href="mailto:colsen@fairpoint.net">colsen@fairpoint.net</a></div><div><br></div></span><br class="Apple-interchange-newline"></span><br class="Apple-interchange-newline"></span> </div><br><div><div>On Feb 10, 2011, at 3:58 PM, Sacie Lambertson wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">This makes sense to me if there appears to be no leaks in the system. System installed in 2007. Comments appreciated. Sacie<br><div class="gmail_quote"><br><div bgcolor="#FFFFFF"><div>" I've been piecing together some other aspects of this system with my plumber. I am moving toward an electrical or mechanical problem with the pumps. I bled the zones last night and found no air in any of them.<br> <br> My next step is to do amp tests on all pumps. They all seem to work intermittently, which I've seen some discussion of in Taco pump forums. The insides of these pumps can be replaced. The flow through these pumps appears to be just enough to push water through the lines. If there are any inefficiencies in the pumps, then there isn't enough flow through the heater to turn the burner on."<br> <br></div></div></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">_______________________________________________</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Greenbuilding mailing list</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">to Send a Message to the list, use the email address</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><a href="mailto:Greenbuilding@bioenergylists.org">Greenbuilding@bioenergylists.org</a></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">to UNSUBSCRIBE or Change your List Settings use the web page</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><a href="http://lists.bioenergylists.org/mailman/listinfo/greenbuilding_lists.bioenergylists.org">http://lists.bioenergylists.org/mailman/listinfo/greenbuilding_lists.bioenergylists.org</a></div> </blockquote></div><br></div></body></html>