My brother in law installed a toilet in his basement. Everything
seems find, except that now the toilet on the 2nd floor works, the
toilet in the basment works, but the toilet on the first floor won't
flush. He took a shop vac up on the roof thinking he needed to clear
a bird nest out of the vent pipe. THere was no bird nest. He did find
out that while he had the shop vac running the toilet on the first
floor would flush. What has he done wrong?
What does "doesn't flush" mean? Does the bowl overflow?
Water swirls around?
How was the basement toilet connected into the drain?
Simply adding the toilet, either with a TEE/WYE, or hacking
a hole in the pipe should not have affected the upstairs toilets.
Even not venting the basement fixture would have zero effect
on upstairs flush.
Suspect either debris in the pipe or...problem in the 1st toilet itself.
Try the bucket test: Rapidly dump several buckets of water in the
first floor toilet. Does the water go right down??
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