Intellichlor service light no longer lit

[charsand]

Yesterday, after turning on my SWG for about a day after finally getting my pool to crystal clear after having a swamp about a month ago, my service light came on and showed code 120.

When I went outside to begin the cleaning of the cell (a day later), the service light was no longer lit.

Does this type of thing happen frequently? I will clean the cell today......I'm just curious if this means I should expect more problems????

Thanks