Question about Superior Lennox Blower Thermal Sensor - BTS

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Water is starting to be seen on the pan under the furnace/blower in attic and air pressure is very low comming from the vents to cool. I am thinking there is a clog in the water piping and if that is the problem I need to know how to fix it.

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This usually happens when your system isn't charged right, meaning, over or under charged, or you have a problem with the return air being restricted like the filter being to dirty. Anyways, the coil on the inside of the unit is freezing up which is causing the excess water and the low air flow. First check the filter since thats the cheapest, but it's more than likely the charge of refrigerant thats the problem. Hope this helps.

Posted on Jun 26, 2010

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Posted on Jan 02, 2017

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My furnace will not start the ignition process unless I disconnect the pressure switch (combustion tube not blower tube). What could be the cause? It's a new pressure switch. The vent pipe is clean.


I assume when you say you disconnect the pressure switch you mean you jump the wiring terminals? You say your vent is clean,but what about your combustion air inlet piping? Is it clear. It is not unusual for a furnace to sit over the summer and have the condensate drain trap dry out. This drain will drain the condensation from the blower and discharge to drain. If there is no water in the trap, it can allow air to flow up through the drain, which will cause a drop in the negative pressure. Try "priming" the trap by pouring enough water down drain hose until water comes out by the drain. If that doesn't work check to be sure motor is going full speed and that there are no creatures that have crawled into your inlet piping over the summer.

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Does drip pan need to cover entire furnace or just coil. I got both answers for repair men.


When you say drip pan are you refering to a pan located under unit in case drain plugs ? If this is what you are talking about and you have a furnace that is 90% efficient or more which will be vented with pvc, it needs to be under the whole furnace as condensate water also comes from furnace when operating and if this drain plugs you will also have water leaking down from furnace. If it is a 80% furnace which will be vented into a chimney then pan needs to be just under a/c

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PRSSURE, DRAFT SAFGUARD, AUX-LIMIT SWITCH(WHEN USED)OR BLOCKED VENT
SWITCH(WHEN USED) DID NOT CLOSE OR REOPENED (DOWNFLOWONLY)
If open longer than five minutes, inducer shuts off for 15 minutes
before retry.
Check for:
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* defective inducer motor
* restricted vent
* excessive wind
* low inducer voltage(115VAC)
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If it opens after trial for ignition period, blower will come on for
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Check your air filter for blockage, check pressure switch for a buildup of moisture. Make sure your inducer motor is turning and creating a vacuum to the pressure switch. Make sure all venting is clear and free of water or debris. Make sure there is no water in inducer motor and all drains are draining.

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I have a GMPN080 horizontal gas furnace in attic of my home. What is the purpose/function of the drain trap assembly in furnace. Cooling coil is external to furnace?? Please advise, looks as if someone has...


The reason for the trap is to compensate for the negative pressure the drain line is under. Since the blower is pulling the air, if the trap wasn't there, then the drain wouldn't drain properly.

By having a trap, your blower is pulling air back through the trap while the condensate water is allowed to flow and drain.


With that being said, if you have water forming in your emergency pan, its an indication that the main drain line is clogged up. If you know where the drain line exits the home, take a small shop van and vacuum out the drain line. If its really backed up, it will sound like a golf ball through a garden hose.

If your trap has a clean-out installed, I would recommend pouring some hot water and bleach combination down the trap itself after you have cleared and flushed the drain. The bleach will assist in killing any mold/mildew that has accumulated in the drain.


Also, while your in your attic, ensure your emergency pan has a float switch and that its operating properly.


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1 Answer

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If you are referring to the secondary pan there could be a problem with your drain line.i would find the drain at the exterior of your home and **** it out with a wet vac..most A.H.Us have float switches or moisture sensors.They will shut down the unit if the drain clogs.

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sounds like your not getting a low voltage signal to the condenser, if your Air handler is in the attic check your secondary drain pan it might be off on the float switch, if your air handler is in a closet you need to check your float switch, it will have some wires coming out of it. Hope that helps you get started.

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