Vacuflush pump runs constantly.
I'm at my wits end on this one.
Replaced all duckbills.
Checked all hose clamps
Listened for leaks - none heard
Bowl holds water.
Test flushed to confirm there's plenty of vacuum in the system. There is.
Spent $193 of my favorite dollars for a new vacuum switch.
After all that, I turn on the breaker and the pump still runs and runs. I just touch the knurled plunger on the switch and it shuts off the pump and it stays off. I give slight tug on the plunger and the pump comes back to life but does not shut off. Touch the plunger again applying very light pressure and it goes off. Go to the toilet to test flush and the pump comes to life normally but refuses to turn off. I return to the vac switch, softly touch the plunger and the pump stops.
It's almost as if the system is achieving 95% of the vacuum needed to trigger the vac switch.
What the heck is going on?
Re: Vacuflush pump runs constantly.
Thinking this through over a beverage....could it be possible I have a small leak in a hose somewhere that only opens up when vacuum reaches a certain level?
I think the hose is the only thing left to replace...
Re: Vacuflush pump runs constantly.
Check bowl seal. I had same issue that caused pump to burn out
Re: Vacuflush pump runs constantly.
Have you checked the pump diaphragm? I had a split in one once and it caused it to run.
Re: Vacuflush pump runs constantly.
Over the years I have had similar issues and each case it was the bowl seal. Simple fix. One way to
get an idea before you dismantle the head to replace the seal is to take a small piece of Scotchbrite pad
and with the water shut off and the pedal totally depressed, clean the existing seal. If it helps even a
little, then dismantle the toilet and install a new bowl seal. While you're at it don't forget to replace the
seal under the head as well....
Walt
Re: Vacuflush pump runs constantly.
Quote:
Originally Posted by
Walter P
Over the years I have had similar issues and each case it was the bowl seal. Simple fix. One way to
get an idea before you dismantle the head to replace the seal is to take a small piece of Scotchbrite pad
and with the water shut off and the pedal totally depressed, clean the existing seal. If it helps even a
little, then dismantle the toilet and install a new bowl seal. While you're at it don't forget to replace the
seal under the head as well....
Walt
Walt, if it was the bowl seal, wouldn't the bowl lose water and start sucking air? This is not the case. Bowl holds water fine.
Re: Vacuflush pump runs constantly.
I just replaced the hoses in the engine room going to the two vacuum pumps. Although the toilets seem to flush nicely, neither pump would turn off on it's own. The hoses did not leak liquid but they seemed old and brittle so I replaced them. Both systems now work as advertised, pumps now shut off and system holds vacuum.
Lucky me, P
Re: Vacuflush pump runs constantly.
If water stays in the bowl, the seal is good
A cracked diaphragm will result in black water spraying out
Make sure the duckbills aren’t deformed when the fittings are tightened. I always use liquid soap on the flanges. Don’t over tighten
If the pump stops when you touch the rod on the switch, it s usually the switch. But you said you replaced it... one of mine does that sometimes but the switch is 15 years old
If you had a leak the pump would stop but cycle on and off. It really sound like the switch.
Re: Vacuflush pump runs constantly.
Quote:
Originally Posted by
Pascal
If the pump stops when you touch the rod on the switch, it s usually the switch. But you said you replaced it... one of mine does that sometimes but the switch is 15 years old
If you had a leak the pump would stop but cycle on and off. It really sound like the switch.
I bought and installed a new switch today. Not the switch because it's acting the same as the old switch.
Re: Vacuflush pump runs constantly.
If its adjustible, have you tried adjusting the spring on the switch? Also maybe sounds like the vacuum indictor is binding. Try spray woth teflon or silicone.