If the UV lamp is not working, it is most likely because the housing containing the bulb is not "Clicking". There is a sensor on the inside cap that presses a metal handle that turns on the light. If this is not depressed, there is a high possibility this is causing the UV light not to turn on .
This should be the FIRST thing to check and should be an EASY fix, instead of getting a replacement bulb.
These instructions are for CUV-109a and CUV-172a
VIDEO EXPLAINING HOW THE TWIST ON BULB WORKS :
VIDEO EXPLAINING HOW TO SCREW ON:
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