Aqua logic false "low temperature"

Had a power outage that caused problems with our Aqua Logic PS8. After fixing "Chlorinator Off - No Cell Power" error (required re-soldering a relay where the circuit board was scorched), we then got a "Chlorinator Off - Low Temperature" message, even though the actual water temperature is 84 F, and reads such in Diagnostics display. Flipped the breakers off then on and the message disappeared. It's been running fine a couple hours now, but wondering if anyone has any idea what would cause the false reading?

Water temp 84 F
Salt 3000
Chlorine 3
pH 7.6
CYA 60

20,000 gallon inground plaster pool
Intelliflo VS SVRS pump
Sand filter
Goldline T-15 SWG
Aqua Logic PS8 controls