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You think it could be the thermistor, cause once I had the code(OP) come up on the board and that was for the thermistor.
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I think that the SH and OP codes both refer to the thermistor, but may be caused by different things. Clean off the tip of the thermistor and if that does nothing, change it out for a new one. It's a cheap part and it may work. Let us know what happens.