We recently purchased a Momentum 388m (with rear half bath in garage) and we are having an odd problem with the black tank flush for the main front bathroom. It is leaking at the vacuum breaker when in use. But, the strange thing is that the leak only occurs when we use the rear black tank flush first. We have replicated it twice,but it only happens when the rear flush is used first...what could be causing this?
Here is the exact sequence:
Incident 1:
1. Dump and use blank tank flush for rear half bath. No leaking.
2. Dump and use black tank flush in main bathroom, leaking at vacuum breaker within 5min.
incident 2 (1 week later):
1. Dump and use blank tank flush for main bathroom. No leaking.
2. Dump and use black tank flush for rear half bath. No leaking.
3. Go back to front tank (sensors still reading full and thought since it wasn’t leaking, could try more time), use black tank flush, leaking at vacuum breaker within 5min.
Looking at maintenance records, it might have been happened a couple times since new, but dealer could never replicate it and I’m guessing since it only happened under certain conditions, previous owners didn’t encounter it too frequently.
We could always flush tanks in order that seems ok (front first), but I would like to fix whatever is causing this if possible. Or, is it a known thing that the front flush needs to be used first?
Here is the exact sequence:
Incident 1:
1. Dump and use blank tank flush for rear half bath. No leaking.
2. Dump and use black tank flush in main bathroom, leaking at vacuum breaker within 5min.
incident 2 (1 week later):
1. Dump and use blank tank flush for main bathroom. No leaking.
2. Dump and use black tank flush for rear half bath. No leaking.
3. Go back to front tank (sensors still reading full and thought since it wasn’t leaking, could try more time), use black tank flush, leaking at vacuum breaker within 5min.
Looking at maintenance records, it might have been happened a couple times since new, but dealer could never replicate it and I’m guessing since it only happened under certain conditions, previous owners didn’t encounter it too frequently.
We could always flush tanks in order that seems ok (front first), but I would like to fix whatever is causing this if possible. Or, is it a known thing that the front flush needs to be used first?
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