Boiler will not turn off

[Reallyretired]

I have a Truma 6e which seems to work fine except with one peculiarity in that sometimes it won't shut down. The knob can be set to the O position and it just keeps going indefinitely several hours anyway.
Anyone ever come across this before. Seems to happen after running on gas.

 

[RobbyMClark]

.

 

[Reallyretired]

Just remembered that the last time I had this problem. Turning off the main switch at the ebl resolved it temporarily though a permanent solution would be better.
I will try this later.

 

[Odd-no-more]

My guess would be a sticking relay on the PCB but it is only a guess

 

[jockaneezer]

Can you spray some contact cleaner on the switch's terminals just to rule that out ?

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