McElroy Discussion Forums

Hi there! I currently have an older model 1236 machine (C14299) that we broke down to change out the seal kit on and upon reassembly the heater is not working. I have now tried two different K2 contactors. The RTD is reading the correct resistance of 109 ohms at room temp. The only thing now I can think of is something got moved around when the control box was detached from the bracket. We have checked all of the connections on the terminal block and that all seems good. We have full voltage all the way down to the K2 from both the 240V leads as well as the A1 and A2 wires.

My question is how do I know if the potentiometer has gone bad? The RTD looks good. we have 240V coming in. We have voltage (178V and 80V) coming out of the potentiometer heading to the terminal block and switch.

The older machines use a potentiometer that is around 500 ohms if you measure red to black wires. Then measure from black to white and it should be around zero with the dial turned all the way to one side and around 500 when it is turned the all the way the other direction. It should never read open.

I received a new TC1 and everything works fine!

Thank you very much for the reply Josh. I hope all is well.