Broken pipes are the most common repair that necessitates professional assistance. Other tough problems may include leaks, sewer line problems and water heater issues.

Check the tank and bowl for leaks, loose bolts or connections.

Yes, if they are exposed to low temperatures.

Typically you would start with a plunger or plumbing snake. If that fails, sometimes mixtures of baking soda, vinegar and hot water could do the trick.