Thermoking SB-210 Communication failure lost controller connect

Tighten battery terminals then open control box.Check for 12 volts at board if it has 12 volts and led light in center of board isn't flashing then board is bad.

 

Hey I’m having the same issue with my trailer. I checked battery terminals 12 volts at the board and green light flashing. But will run for awhile then it does it again. And shows no codes. Can anyone help?

 

The board has a device on it called a poly switch.Sometimes it will start to fail when it gets hot.Typically unit will run and then eventually cut out.When you restart it will run again for a while then fail again.This could be your problem unfortunately the only fix for this is to replace the board.

 

I had one do this last week with 10,000 some engine hrs, I open the relay box door found the inside VERY wet because the black Capplug had fallen out of its hole allowing water to get in from rain or outside trailer washing, I unhooked the battery right away then dried this box out completely, made sure the plug was back in place, I then test ran this unit set at 33⁰ for 24 hrs so far lucky not to need a new main board