Call a professional for toilets that won’t stop running after basic adjustments, toilets that rock or move when you sit down, persistent clogs that return after plunging, or any water leaking around the base. These issues often indicate problems with internal mechanisms, wax ring seals, or drain line blockages.
Also call for toilets that flush weakly, make unusual noises, or have cracks in the bowl or tank. Attempting DIY repairs on these problems often makes them worse and more expensive to fix properly. Professional diagnosis saves time and prevents costly mistakes.