<div dir="ltr"><div><div style="font-family:tahoma,sans-serif;font-size:large" class="gmail_default">I had the same issue for almost a decade on a furnace installed back in '87, 30 yrs later in 2017 it started having the same issue requiring me to blow though the tubes which fixed it for about a month each heating season. Condensation messing with the pressure switch(es).</div><div style="font-family:tahoma,sans-serif;font-size:large" class="gmail_default"><br></div><div style="font-family:tahoma,sans-serif;font-size:large" class="gmail_default">I did that until 2023 when my wife suggested that I was having an uncomfortable longterm intimate relationship with the furnace and suggested we get it replaced...New beast is now in place for 2 years+. </div><div style="font-family:tahoma,sans-serif;font-size:large" class="gmail_default">Sometimes you just have to say goodbye.<br></div><div style="font-family:tahoma,sans-serif;font-size:large" class="gmail_default"><br></div><div style="font-family:tahoma,sans-serif;font-size:large" class="gmail_default">I still have a bunch of Honeywell control units that might be of some use to somehere here with an older furnace? I likely have a couple of those bi-metal igniters too, All gratis for anyone here who can make use of them.</div><br clear="all"></div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><i><font size="4"><span style="font-family:comic sans ms,sans-serif">Ron S.</span></font></i></div></div></div></div><br></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Mon, Feb 9, 2026 at 2:58\u202fPM Mikalai Birukou via kwlug-disc <<a href="mailto:kwlug-disc@kwlug.org">kwlug-disc@kwlug.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
> There are these little pipes that go between enclosed area in furnace<br>
> and membrane switches to detect presence of pressure difference between<br>
> normal/room and that enclosed area with air/fumes flow.<br>
><br>
> Other season, there was a burned ash in one of pipes, after burner, I<br>
> suppose.<br>
><br>
> One more season, I gently blew in and out of pipe into membrane switch<br>
> to hear it flip. It got unstuck, and continued proper operation.<br>
><br>
> This season, a pipe had a drop of water in it. Surface tension in a<br>
> small radius obvious stopped pressure difference from pushing membrane.<br>
><br>
> I guess, cleanup includes dusting furnace, and blowing through some<br>
> pipes. :) Noting that three events happened over 15 years.<br>
<br>
Better word, little tubes, rubbery tubes few millimeters in diameter. <br>
Not pipes.<br>
<br>
<br>
<br>
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