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Old 07-09-2015, 06:39 PM   #1
Junior Member
Join Date: Oct 2013
Posts: 24
Plugged drain hose-air conditioner

We have a 2013 Tiffin Allegro Bus and one of the drain hoses in the air conditioner is plugged. Instead of running down the drain hose it is coming down on the side of the coach by the driver side window. Any suggestions. Thanks

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Old 07-10-2015, 07:40 AM   #2
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Tiffin Owners Club
Join Date: Aug 2010
Location: Montgomery, AL
Posts: 1,197
First thing is to remove the duck bills from each drain hose at the end of the tubing. Mine are in the rear of the coach accessible by opening the access door to the radiator at the rear. Sometimes algae will cause clogging at the duck bill. Turn on only one ac at a time and wait to see if water is dripping from the drain - that will identify which ac line is clogged.

If removing the duck bill doesn't clear the blockage you have to go up on the roof to the unit. Remove the shroud (very easy with a screwdriver, may have 4 screws holding it on). After removing the shroud you should be able to clearly see the drain hose connected to the condensate pump. Disconnect the hose and blow through it using low air pressure. I use canned air. Caution: hold that hose tight and don't let it disappear on you!

If that doesn't clear the clog, then your condensate pump might be bad. Replacement is not hard but you do need to be careful of power. Turn off everything before working on it. Shore power, 12v switch at the door and battery disconnects. Also I turn off the inverter so no chance of getting zapped.
Mel (Melanie) and Harry
2009 Tiffin Phaeton 40QTH
2014 Jeep Wrangler Sport
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air conditioner

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