Question about Ruud Matching Split Air Conditioner

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Float Switch on primary condensate drain.

My unit is equipped with a float switch in the auxillary drain pan to kill the unit if the pan fills. The unit is 11 years old. I have noticed that some of the newer installation have a float switch also located in the promary condensate drain. Should I add this to my unit?

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I think...yes. Stopping the machine before the water fills the secondary pan couldn't hurt, but don't take the secondary switch out. (Wire it in series with the primary switch.) Air conditioners get plugged up in places besides the primary drain pipe and the secondary switch wii catch anything the first one misses.

Posted on Jul 25, 2008

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Posted on Jan 02, 2017

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My split air conditioner,s compressor is not starting , whtat to do?


Check for obvious things like a blown fuse or open service switch near the condenser unit (the outside part). Make sure that power (most of these are 240V) is available to the unit. Please, do not work on live electrical equipment unless you are 100% sure of what you are doing. You don't get a second chance at these voltages.

On the thermostat, make sure the mode switch is set for cooling, the fan switch is set to on or auto and the temperature set point is set below the current room temperature. If a programmable type thermostat, make sure the time, date, and program are correct; or override to manual mode so that your settings are followed. Check the air handler to make sure that filters are not clogged with dust and dirt - if they are the unit may have iced over the cooling coils. If this has happened, replace the filters and allow time for the ice to melt off the coils. Many air handlers have large, shallow pans installed under them when located above a living space. This is to collect condensate that leaks out of the unit. A pipe will be connected to the pan to allow the pan to drain this condensate off to the outdoors. If the pan is full of water, the drain pipe is clogged and will need to be snaked clear to empty. Locate the float switch. The float switch monitors the water level of the pan, so once it is empty - the switch float arm should be resting on the pan floor - not in the up position (which prevents the unit from starting).

These are the most common home-owner correctable issues that will prevent a unit from starting - there are many others that require advanced skills and equipment to detect and correct. Some of these are: low refrigerant gas, bad motor, bad start / run capacitor, bad relay coils, bad transformer, bad thermostat, the list goes on and on.

If all these items listed above are ok, the unit should attempt to start. If the unit still will not start or buzzing sound is heard professional service is likely required.

Good luck!

Aug 20, 2012 | Air Tools & Compressors

1 Answer

Mitsubishi City Multi VRV unit fault code 2502


2502 code indicates float switch issue. Try taking a wet vac to the outlet of the drain line and cleaning it by vacuuming the outlet. This will clear the drain line if it's not tied in with multiple drains, but may not clear the code. To clear, try tuning off breaker(s), wait 10 mins, then turning breakers back on. If this doesn't help then there is an issue with the float switch or the control board. Float switch is supposed to prevent the drain from over flowing and is normally located in the condensate pan, but I don't advise anything else, other than cleaning the drain line and resetting the system.

Jul 24, 2012 | Mitsubishi Heating & Cooling

2 Answers

Once the 'condensate tank' is drained the unit will NOT reset....The tank full light stays in and the Unit continues to run the fan, but will not heat ...for HOURS........Help.....I realy did


When our unit was moved with a full condensate pan, the switch lever became lodged in the "full" position and the unit wouldn't heat. This is how I fixed it.

1. Unpug the unit.
2. Remove 8 screws from the housing.
3. Remove the rear housing, swinging the bottom away from the chassis.
4. Remove the front housing similarly, taking care to release the tabs from the vertical chassis rail, and avoid stressing the wire leads to the control panel.
5. The condernsate float and switch are at the right front at the base of the chassis. Assure that the float is free from obstruction and debris in the condensate pan. Assure that the switdh lever is free to travel to the limits.
6. Re-assemble the unit it reverse order.

Apr 21, 2012 | Soleus Heating & Cooling

1 Answer

Drain pipe was clogged. I cleaned everything in it. When I went to turn the unit back on, it did not come on. Is there some type of reset switch that I can hit to get it on. Yes, I checked the breakers,...


You probably have a tripped condensate overflow switch. This switch can be on the primary drain line, the secondary drain line, or inside the unit in the condensate tray. Find the safety switch and reset it. It almost always will be some type of float switch. So you will have to get the water out so it is not floating or it could possibly be stuck.
Hope this helps.

Sep 03, 2011 | Heating & Cooling

1 Answer

"Check drain" light is on


If the float switch is indicating a full drain pan, the light will be on and the compressor and fan will not run. Make sure the dehumidifier is installed level and the condensate drain is open allowing the drain pan to empty. Next check that the float is free to move up and down and the switch operates a required. Call the manufacturer at 1-800-533-7533 for parts and instructions if there is a problem wirh the float switch.

Aug 06, 2011 | Therma-Stor Santa Fe Compact Dehumidifier...

1 Answer

Why does my engine cut off?


Possible reasons are;
  1. Water condensation in the gas tank has partially filled the carb float bowl. Bikes don't run well on water. Remove the drain plug on the float bowl to drain the bowl.
  2. Install a new spark plug to eliminate possible carbon shorting.
  3. Check the side-stand kill switch. Broken or out of adjustment it can intermittently kill the engine.
  4. A loose or dirty plug in connection on the power wire to the coil.
  5. Bad kill switch on the handlebars.
  6. An abraded kill switch wire or power wire.
Start at the top and work your way through the list. If that doesn't work you will need to go to the dealer and have them check the coil, CDI and other ignition components.

Jan 15, 2010 | 2006 Yamaha Ybr 125

1 Answer

My ac unit still not turning on even when I reset. How many times should I hit the reset botton?


make sure your drip pan is not filled with water.
This can cause the "float switch" to shut your unit off to prevent water from leaking all over the place.
Simply use a wet vac to unclog the pvc drain line located outside by the condenser. sometimes these lines get buried. check for water around the outside (condenser) unit.

Sep 17, 2009 | Heating & Cooling

1 Answer

Pan missing when RUUD unit was installed causing problems with AC


I think your talking about an emergency drain pan. Is condensation building up on the outside of the unit? If it is, it means that the unit is not draining properly and the is too much water sitting in the main condensate pan. If you don't have the emergency pan, then the condensate drips from the unit onto the ceiling in your attic. I'm assuming a lot of things but this is what I think you are asking. You will have to find an ac supply company that will sell you an emergency pan and then it must be piped to the outside of the home or it can be plugged but with the use of a float switch. This switch will shut the unit off if the main condensate drain becomes clogged. You should have a professional come and wire a float switch unless you are knowledgeable about a/c equipment. I hope this answers your question.

Apr 01, 2009 | Heating & Cooling

1 Answer

Water level float switch error


You do not mention the model, I presume that it is a cassette, in which case the float switch is located in the indoor unit. You have to remove the cover which is 4 screws. First make sure all power supply is turned off. Then remove the drain pan which surrounds the fan blade. You will see in one corner of the unit a slightly deeper part of the drainpan, this is the corner where both the condensate pump as well as float switch is located. Before you do any of this, give a serious blow into the drain pipe from outside and this may dislodge any sludge which may be causing the floatswitch to stick. You can also pull out a rubber plug which is under the pump on the drainpan.

Jan 28, 2009 | LG Heating & Cooling

1 Answer

Armstrong A/C it is not kicking on or cooling??


Does the indoor fan run in on? If yes then you have 24 volts on the control system.
Do you have a float switch on the Air Handler?
If your Air Handler is in your attic the secondary pan can be full tripping the float switch.
also If red is broke on the float switch nothing runs.
If the drain line plugs up the float switch shuts the condenser off to prevent flooding.

May 20, 2008 | Heating & Cooling

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