The fill valve must be clogged. But I can't get the cap off. How do I rotate it while holding up the arm? Is there some trick I am missing? It is a 400 series
The cap will pop off(just a little pressure be careful not to break tabs)then rotate top with arm 1/4 turn then lift valve assembly out there is a diaphragm remove(be sure water to valve is off!!)then turn water on slowly that will flush out inlet tube then you have to clean rubber diaphragm very good(hot water is better to clean diaphragm off with)if that doesn't work you can get new diaphragm from plumbing,hardware,or home improvement stores.
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Toilet is not flushing not sure if chains are adjusted right no suction to **** water down drain
The cap will pop off(just a little pressure be careful not to break tabs)then rotate top with arm 1/4 turn then lift valve assembly out there is a diaphragm remove(be sure water to valve is off!!)then turn water on slowly that will flush out inlet tube then you have to clean rubber diaphragm very good(hot water is better to clean diaphragm off with)if that doesn't work you can get new diaphragm from plumbing,hardware,or home improvement stores.