With a test light.
To trouble shoot a device the problem with the device has to be stated. With a UPS the first thing to check is the batteries.
Trouble shooting is to diagnois whats going on with your computar.
Short the windings and perform resistance testing. Check your rectifier for shorted and/or opened diodes (likely open).
If this is a portable Hot Tub - spa - Jacuzzi, you as a homeowner, should not attempt trouble shooting the components under the spa skirt. You are not qualified nor do you have the proper testing devices. Most likely your electronic heater has failed. You need to call a qualified service tech to do this job -- your life can depend on someone who is knowledgeable of codes and swimming pool equipment. k
It is just an aid to help trouble shoot the problem. Older TVs didn't tell you what might be wrong.
An air compressor is a complicated machine , in order to trouble shoot any problems , there must be a detailed description of the problem/s.
In order to ensure that your electric water heater stays in good working order, you should regularly check for, or if unable to do yourself, have a maintenance person check for any damage or faulty wiring. Regularly inspecting the electrical connections, and piping can allow you to catch any deterioration or wear before it becomes a large problem.
Trouble code P0059 means: HO2S Heater Resistance (Bank 2, Sensor 1) The problem is in a heated oxygen sensor
Have you cleaned the filter lately?
trouble shoot it
A trouble shoot has the same capacity as a troubleshooter and a troubleshooter is an expert in discovering and eliminating the cause of trouble in mechanical equipment, power lines, ect. ** Yes, or in laymans terms: To go through various ways or paths to find out what the problem is.