Note: the change in MUV lamp power is continuous, so this LED indication is entirely indicative. The UV- displays the status of the MUV lamps and the UV system. If the UV runs UV active- if all the requirements (filter signal, temperature of the UV reactor and temperature of the UVEL.box in an acceptable range) are met, then the ignition process of the MUV ®lamp begins, during which the indicator lights start flashing. After the ignition is successful, the light will stabilize.