Whirlpool front load washer strange issues

[Phil McCracken]

Hello,

My 4 yr old WFW9620HBK0 just started having a problem where the water gets incredibly hot during the cycle.  It's not due to the hoses being switched, I believe it's due to the internal heating element in the washer heating the water.  Even when I start a cold wash, the waster is very hot.  In addition, the washer will stay in agitation mode indefinitely.  When I try cycling the breaker for a few minutes, it turns back on, but the door remains locked.  I try to do a drain and spin utility cycle, but it just goes back to agitating again.  I have to drain the washer manually through the low point drain and wait a few hours for the contents to cool before the door will unlock.  Sometimes, I can get away with running a quick cycle wash because with the shorter cycle, it doesn't get a chance to overheat. 

I'm thinking it's the temperature sensor that's bad, but I'm also wondering if it might be a bad board.  The fact that the high temperature is keeping the door locked tells me maybe the temperature sensor is doing its job in that way. 

I’m not getting any error codes.

Just wanted to see if anyone ran into anything similar before I start throwing parts at it.  Thanks!

[Phil McCracken]

Update - I switched the supply hoses and found that during a cold cycle, only hot water is going in, which is why it must be overheating.  For now I have it routed so only cold water goes in through the hot water inlet solenoid.   Tested both hot an cold solenoid valves - both 1200 ohms.  During fill, there is only 120V going to the hot valve and nothing to the cold valve.  I'm now suspecting the control board.  Am I on the right track?

Thanks!