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Air handler will not run clogged up drain?

The air handler will not turn on unless some kind of drain switch is removed, how do yu access the air handler to clear the clogged drain tube?

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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 ).

Posted on Aug 14, 2008

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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.

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Sorry, but not enough information.

Required information:

Is the inside unit running, if yes is the contactor pulled in outside. If no try locating float switch on emergency drain pan ( could have a clogged emergency pan drain line)

Any further information you could provide could be useful in diagnosing your problem

Refrigerant type
Refrigerant Standing Pressure
Power at Disconnects for A/C units and if so whats the voltage
Breakers in Electrical Breaker Box (Any Tripped or in the off Position)
Water present in emergency pan underneath Air Handler
What pieces of the A/C Equipment or running if any ( Air Handler, Condenser Fan Motor, Compressor)
etc

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1 Answer

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Melvin

St Louis

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1 Answer

I have central a/c. The drains in the air vent in my house instead of outside. How do I find the drain pan?


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Once a year - bleach water should be put into the drain pipes to avoid clogging..

I hope this helps !

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