I have an 18 foot Coachman Catalina Travel Trailer. The black water tank doesn't drain, meaning I have to siphon it out every 3-4 days. Does anybody have any ideas what the problem might be and what options there are for repair?
ANSWER: Greetings Greg thanks for submitting your question on our Ask An RV Question Page.
With the information you have provided me I really cannot tell you the exact problem with your Black Water Holding Tank. If it is because the Holding Tank Dump Valve is not opening and closing, you will probably end up having to replace the Dump Valve.
In some cases the holding tank itself could have a blockage in it. Sometimes using Holding Tank Waste Digesters can clear up the blockage. If all else fails, you may have to take the trailer in and have the holding tank dropped and cleaned out manually.
We have all kinds of information on holding tank care and maintenance on our website you might want to review the answers I gave to the questions listed below to get further information.
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