Strange Behavior for a Toto

[matt0664]

Alright, I just remodeled my bathroom. Apart from adding a 3" drain for my shower, and a new 2" vent I did nothing else with the pipes. I put in a new Toto two piece pacifica. I love the toilet. It was working well, for about a week until it woke me at 4am this morning with a strange gurgling sound. I flipped the lid to see large air bubbles coming up into the bowl
I tried flushing the toilet but it only filled with water
slowly, the water subsided
I plunged it- gasp! but the only change was that it drained a little faster
Gone is the mighty flush
What happened?

[Cass]

Sounds like your sewer line is backing up. Toilets do not make air bubbles, like your describing, on their own.

[matt0664]

The toilet is in the basement. However, there is a check valve installed -about 30 feet away- in the waste line.
An additional note: The toilet went back into normal mode later on in the morning, but I'm still hearing intermittent gurgling noises and seeing air bubbles.
PS> the check valve was installed years ago for the very reason you mentioned- our street seems to have a problem with the main line which caused the prior owner's rec area to fill with...you can guess what.

[jadnashua]

Check valves often don't seal completely, especially after they get older and things get trappped in their sealing area. Yours could be leaking a little. Nothing to do with your toilet.