My heater routinely registers temperatures approx 10 degrees hotter than actual, and so high limit turns it off before I reach desired temp. This is not a thermistor issue, as I can swap in a brand new OEM thermistor and it might work for a minute or two, but then the temperature jumps back up and shuts off. Weird thing is, if I shut the heater off, switch the two wires on the thermistor (just trade them between the two posts), and fire it back up, the temp will usually be correct, and often will stay correct for ten minutes or so, before walking quickly up to a higher than limit number, and once again the heater shuts off. So, getting the heater up to about 90 degrees is fine, and if I do this wire switch trick 5 or 6 times, I can get it from 90 up to 100 where I want it (I get a few degrees with each wire switch), but am pretty sick of it.
It is not a thermal regulator issue because this behavior existed before I cracked the manifold (overtightened the thermistor when swapping it out), and the new OEM manifold replacement kit I installed came with all new everything, including thermal regulator and high limit switch, thermistor, etc., and the behavior was the same after that repair if I ran the motor at top speed (though a slightly reduced speed would sometimes help keep the temp accurate).
Crazy behavior, so I am guessing it is the control board? What else could it be? I hate swapping parts without knowing, but thinking about biting the bullet on the control board.
Any suggestions would be appreciated! Thanks,
Paul
It is not a thermal regulator issue because this behavior existed before I cracked the manifold (overtightened the thermistor when swapping it out), and the new OEM manifold replacement kit I installed came with all new everything, including thermal regulator and high limit switch, thermistor, etc., and the behavior was the same after that repair if I ran the motor at top speed (though a slightly reduced speed would sometimes help keep the temp accurate).
Crazy behavior, so I am guessing it is the control board? What else could it be? I hate swapping parts without knowing, but thinking about biting the bullet on the control board.
Any suggestions would be appreciated! Thanks,
Paul
