Reef-Pi ATO undervoltage detected

[genericfishname]

My ATO has stopped working. Almost immediately after I enable it, it disables itself and i get this error in the logs. I am using a mechanical float switch. I verified the float switch is working with a VOM. Any suggestions in trouble shooting are appreciated.

 

[theatrus]

How did you wire the float switch? How are you controlling the pump? Description and pictures would help.