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I have a lennox central air, the air handler has a " SAFE-T-SWITCH" that has a float on it the tube it sits in fills with water and keeps turnig off the ac ??

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The safety switch is working the way it should why are you getting the water the switch is to shut system off so you dont damage the system,sheetrock,floor ect..

Posted on Sep 11, 2010

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Honey thermostat RTH6500WF IS BLANK SCREEN


Change the battery in your thermostat first. The next likely issue would be condensation not draining. I would bet your air handler is in your hot humid attic. That means you have a drip pan under it and likely a tube from the air handler leading to the out side to allow condensation to escape to the outside of your home. On that tube from the air handler, there is a float switch which tells the A/C system to shut off so condensation does not back up into your house and ruin your insulation or ceilings. That is likely why your thermostat goes blank. The tube that drains condensation from the air handler to the outside builds up a slimey substance over time (especially in high humidity) and that clogs your drain tube. Using a shop vac, either blow the tube out or suck it out. Manually reset the float (should be down). You can find the float in the tube simply because it "should be" the only thing on the tube that has wires coming from it. Reset your thermostat using the switch for your A/C in your fuse box.

Oct 16, 2014 | Honeywell VisionPro 8000 TH8110U1003...

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Lennox Elite air handler will run cold for a while, then it will blow warm air out until the safety switch is moved, then it will make a noise in the system which sounds like air hissing, then the cold air...


sounds like installer broke on yellow wire between thermostat and condenser. your switch is breaking the 24 volt signal to cobdensor when the internal float is activated. moving the switch is somehow allowing bobber to drop enough to reactivate 24 volt and condenser comes back on. refrigerant starts to recirculate again and thats what your hearing in the lines. the switch prevents evap coil pan from spilling over into your return when the drain is clogged. use a shop vac and clear your drain. i blow it out with compressed nitrigen. after line is clear prime it wuth 32 oz of water.

Aug 07, 2013 | Heating & Cooling

1 Answer

No 24 v to contactor


The thermostat is the device that determines when the A/C unit starts up. It will require a 24v source (transformer most likely in the air handler) to provide power for the control. If the 24V is present, and the t-stat is calling for cooling, then there is probably a safety device preventing it from starting.

One such common safety device is a water level or "float" switch that detects water level in the pan under the air handler. These are most often found in homes that have the air handler in the attic space. Normally, these pans a dry or have a a few dropsof watrer in them. Condensate is created when warm, humid air is passed over a cold coil. It is collected and routed outside. If there is a problem getting the condensate down the drain pipe in the air handler, it will drip out of it onto the attic floor. This is why a shallow pan is installed under the air handler. The pan will collect the condensate and is piped outside and down to the ground. If the pipe has become clogged - preventing draining - the water would overflow the pan and ruin the ceiling in the space directly below. The float switch prevents the signal from the thermostat from turning on until the water has drained to a safe level.

Check the pan - if it is empty, the switch may have been distrubed and actuated - even though there is no water in the pan. Operated the switch to make sure it can move freely. There may be other safety devices inline like the float switch. You'll need to follow the circuit and find where it is being interrupted in order to make the repair / correction.

I hope this helps & good luck!

Apr 10, 2013 | Heating & Cooling

1 Answer

Condensate drain sucking sound


Sounds like a dirty float switch, making the pump work when there isn't much water in the trough. If you can remove the central fan there is a panel in the corner that unscrews. The pump and float switch are in there. Wear a dust mask - it'll be pretty dirty in there!!!

May 17, 2012 | Heating & Cooling

1 Answer

Central Heat and Air noises.


Hi, It sounds to me that this split system you have is a heat-pump and not a gas fire air handler. The noise that you are hearing must be the freon in the copper lines equalizing in the system upon shut down of the compressor. All systems must and will go through this sequence. It shouldn't be that loud though. The copper lines should have armor flex on at least the larger suction line for insulation and to keep it from condensating everywhere in the summer in the cooling mode.If you find it is bare with nothing on it, you can buy this insulated tubing at Home Depot or O.S.Hardware. Its black in color and is split down the entire 10' section with glue covered seams on it. This should cut down the noise. Depending on the unit size Tonnage wise, the suction line may be 3/4" or 5/8" in diameter.Just ask for there water line insulation and like I said it comes in 10' sections and is very cheap, 20cents a foot or so. Please keep me posted if this does not take care of the problem. It may be coming from the lines where they enter the air handler. I will wait for you're reply.
Sincerely,
Shastalaker7

Jan 21, 2010 | Heating & Cooling

2 Answers

GU1500XTLS3 Periodically won't start. Dishwasher has power because pressing cancel causes dishwasher to start draining (even though there is no water). Door switch works because opening door prevents...


in the front left bottom of the tub is a float switch; it sometimes is under a cover with a screw securing it it looks like a big round ball shaped piece of plastic and on the bottom of this float there's a pin going down a hole in the tub (the float pin sits on the switch and, water lifting up and down on the float moves the switch: listen for a distinct "click" as you move the float up and, down
you see; the float rises as the water fills the dishwasher tub closing the float switch and, signaling the washer to start cleaning the dishes
some times dirt prevents movement of the float but,waiting usually displaces the dirt/soap etc. just enough to make it work again until the float pin gets encrusted again the cure is to clean the float pin

Aug 31, 2009 | Dishwashers

1 Answer

Where is the drain pan on my central a/c/? It drains inside my air vents.


most central a/c units have a drain that either goes into the house drain system or they have a pump with a float activated switch to pump water out once full. to identify you must find your air handler ( the unit that blows air into the house) remove the lower panel and look for one of the foremantioned drain systems. could be a simple mold problem, mold tends to build in the drain tubes because the flow of water is relatively low.

Aug 19, 2009 | Heating & Cooling

1 Answer

Air handler will not run clogged up drain?


the air handler is in the attic or in a closet right? most likely the drain switch mentioned is in a pan located underneath the air handler, the switch is actuated when the condensation drain tube is clogged, ( when it cannot drain the water out of the pan), the float switch is actuated and the unit shuts off to prevent any more condensation, thus preventing overflow into your house/apt. the drain line can be sucked out by using a simple wet/dry vacuum of any kind from the end of the drain line ( usually a 3/4 inch PVC pipe located somewhere outside ).

Aug 14, 2008 | Heating & Cooling

1 Answer

Dishwasher won't fill


i would check your incomingwater supply after replacing faulty water inlet valve for faulty solenoid(chances are debris fouled that one. dissconnect at valve ck your pressure, possible after turnig of your water supply your shut-off valevwent bad and not fully opening

Jan 26, 2008 | Kenmore 15522 Built-in Dishwasher

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