Had this issue last Firday
Walk in freezer ( " converted" to walk in cooler) with Beacon 1 set up. came in and found case at 60* going off on hi temp alarm.
Find coil iced up with about 2" thick ice on back and inside. Go to put into manual defrost and it defrosts for about 8 minutes, fans off no heaters.
Check relay and no 24dc to coil to cut heaters on.
I ended up de icing the coil, and installing a paragon time clock in the condesor breaking the contactor to defrost. Cleared the defrost times out of the smart control in the mgrs office. and now it is a regular WIC air defrost and no more issues
Has anyone found or seen a reason that the control isnt sending control voltage to the relay?