Homeowners will have a difficult time identifying if the ballast is bad. The Voltage from the transformer can not be tested accurately unless you have a special tester that is very expensive. The ballast can be bad and have a reading so the only way to test them in the field is to install a new bulb. If the new bulb lights then the ballast is fine, if it doesn't then the ballast needs to be replaced.
If you are handy this isn't too difficult of a job to do on your own (see other customers product reviews below on their experience).
Feel free to give us a call if you need assistance with your Paramount Clear O3 Ozone System.