Some bathroom heaters require a separate circuit as they require more power than one lighting circuit can provide. Depending on how the home is wired the power might go from the light/fan/heater to the switches or vice versa. The wires will need to be traced to determine how it is wired. Somewhere there is an open circuit.
If you are electrician illiterate, you should find someone that is not to look at this for you.






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