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I have a master temp 400 that has no power due to the easy touch control system not giving it power. (Fireman switch) I figured that much out so far. Both temperature sensors for my pool and spa are reading 188° in the middle of winter. Could they both have gone bad at the same time? Should I...

I did a FAS-DPD chlorine test using the 25ml sample last night and this morning to check if my chlorine was dropping over night (it's not). It was at 7.2ppm. That seemed higher than it should be so I did the 10ml test which I normally use and I got 5.5 ppm. Can anybody explain this difference...