should the motor in a 3 port valve get red hot

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as title

should the motor in a 3 port valve get red hot

having trouble with my 3 port valve,when only asking for hot water the rads are getting hot as well,took the cover off the 3 port valve and the motor is very hot ? thanks
 
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I would say warm to touch, but not red hot.

Sounds like the valve body has stuck mid position.

With the head off, can you turn the spindle freely?

Personally I would replace the entire valve ;)
 
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