My Delta UV 254 filter will not turn on, it is plugged in and the plug is live but it will not turn on. I notice that the light on the power supply is also not illuminated, so I am not sure if my power supply has gone bad or if the UV light bulb has burnt out. I pulled the light bulb out and the filaments look to be intact but there is some blackening that is happening at the ends close to the filaments.
