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Old 01-06-2020, 03:58 PM   #1
Junior Member
Tiffin Owners Club
Join Date: Aug 2018
Posts: 5
Black tank flush not working

I dump my black tank and go to flush it with my hose that is connected to the control panel turn on the water and nothing happens. It is a 2011 Allegro Open road, also lost the aux plug for 12 volt, need to locate the fuse. Can anyone help.

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Old 01-06-2020, 07:27 PM   #2
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Tiffin Owners Club
Join Date: Feb 2017
Location: Frankfort, KY
Posts: 1,124
On my unit, had the same problem. Read that Tiffin didn't make the holes large enough so I disconnected the black flush connected to the tank and drilled them out a 1/16th larger than the original holes. Has worked great since then. Not sure it is your issue but might be worth checking out. Either way, I would guess that the plug is clogged and a cleaning at minimum is needed.

Scott Brandstetter
2014 Tiffin Allegro Bus 45LP
Full Timers for now
Home State is Kentucky
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Old 01-06-2020, 09:25 PM   #3
Join Date: Jul 2015
Location: College Station TX
Posts: 72
I had same problem. Flush nozzle is on top of black tank. My access was to remove the side panel on the passenger side just in front of the rear tire. It was plugged. Drilled out holes slightly larger. Search the tiffin forum. There is a lot on this.
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Old 01-06-2020, 09:26 PM   #4
Join Date: Jul 2015
Location: College Station TX
Posts: 72
I have a 2014 Allegro Bus 37AP.
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black tank, tank

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