The prices of repairs vary depending on the complexity of the problem, of course. Normal wear and tear items (similar to brakes on a car) are in the $200 - $300 range. Capacitors, contractors, corrosion inhibitors, fuses, igniters, flame sensors and pressure switches can also be in that price range. The more you do at the same time, the cheaper each task will become, and the fewer service interruptions you may experience.