I'm seeking some insight on a toilet problem. Searches on the internet
have not matched my situation so I'm hoping someone lurking here can
give me some advice.
Problem - the toilet bowl will interrmittently not fill completely
after a flush.
older 3.5 gallon flush toilet
identical toilet on opposite side of wall flushes OK, they share the
same drain and I assume the same vent
the tank fills normally (at least all the times I've checked it)
I think I have ruled out the fill valve and the flapper valve (the
easy things to fix).
I don't think the vent is plugged otherwise I'd think the other toilet
would exhibit the same problem.
And I don't think the drain is constricted or again the other toilet
would exhibit the problem.
I'm wondering if the fill holes around the top of the bowl are getting
constricted (but then why is the problem intermittent??)
Any sage advice out there?
Is it filling at all? After a flush there is still some water in the
bowl without any refill water coming in. If the float valve is sticking it
may not be turning on the refill valve so you are not refilling. It may
also be only partly turning on that valve. Second there is a possibility
that there may be some obstruction causing a late full flush.
I would not rule out the possibility that the vent or drain may be
partly blocked. This can happen in the winter if condensation starts
forming ice in the vent. The two toilets may not be reacting the same way
to a partial blockage. I know you have considered this, but I would not
totally rule it out even though your theory is correct and does mean it is
far less likely.
Check inside the tank to see whether the refill tube is actually spraying
water down the overflow tube. Flushing commonly leaves varying amounts of
water in the bowl and the refill tube has to supply enough to bring the
level up from the lowest starting point.
You don't have cats and somebody who takes the cat crap from the
litter box and dump it in the toilet, do you? I had a similar
situation. The small amount of cat litter would build up, partially
clear, then repeat until it clogged entirely.
Break out the toilet auger and have at it. Eliminate the obvious,
Keith, I agree with the other to rule out the obvious, some of which you
have done. I had the oddest one though once in an apartment.
Although it is very unlikely to be your situation, here's what it was. A
second bathroom was added. The newer one, which happened to be the low
volume flush type worked fine. The earlier one, sometimes did what you say.
The culprit was a pressure balancing valve of some sort, set to the new
toilet, but on the same feed as the old one.
The reason why I didnt add it up, was I didnt account for my husband taking
a shower in the 'other bathroom' when I flushed the toilet in the older one.
Although the owners never fixed it (not really critical and once they put a
low-flush in the older bathroom it would go away), it did have us puzzled
for some time.
Once we figured it out, we let the owners know but we both made the same
assumption which was it was better to leave it alone since in a year or so,
they'd end up needing to replace the older toilet anyways and getting the
bigger flush units was already hard by then.
It was caused by slower fill of the back tank on the bigger unit. It
filled, just not as fast. Pretty doubtful this would be the same problem
for you, but the symptoms were identical.
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