Looking for suggestions as to what would cause the following strange behavior with our Jabsco head
. With the Y-valve set to discharge overboard
, the toilet bowl would backflow with what appeared to be previously pumped out bowl contents. I thought this might be related to a blocked anti-siphon valve, so I disassembled and cleaned. That didn't solve the problem.
Only later, when we flipped the Y-valve to holding tank
and pumped solid waste material through the system did the head
resume normal operations. When set the Y-valve to overboard
, the backflow did not occur. The head now appears to be working normally.
The only things I can think that caused this are (1) joker valve became inverted or folded in on itself, not making a seal or (2) the lower flapper valve became twisted or not set properly. Either may have occurred when the head was used (discharge) and the thru-hull was still closed causing back-pressure in the system. This back-pressure could have caused all sorts of problems!
Obviously something internal got wedged causing the backflow -or- the pump assembly is nearing a rebuild
. Note, I just replaced the joker valve and the head is at least 2+ years old since any rebuild
. Any thoughts as to the cause and whether I need to rebuild or wait. Thanks,