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[MTJAG]

Well, I fired up my CB 5036 this week and have an overheating problem.  The temp goes up to 185, but when I go back out an check it, it's up as high as 194.  I noticed this at the end of the season this past May, but it was windy here at the time and just thought it might be over drafting.  I've check the door and damper and both seem to be sealing good.  Any ideas?

[fireboss]

Check again it's got to be getting air from somewhere I was told to put a piece of paper and close the door and try to slide it out  and check the damper the same way  just a thought!

[slimjim]

Probably a bit of gasket leak but more likely that you have a good fire and when it hits temp with no more demand, the coal bed inside overshoots the temp, see if it continues now that you are up to temp.

[Pointblank]

If youve checked over the door seal and damper, Id look at the solenoid. Spray it down good with some wd40 and work it back and forth by hand. Sometimes they get a little sticky. Otherwise, Id look back over the door and damper. If your door gasket is more than a few years old, it might need a new one, they get hard and brittle over time. You also could try adjusting the cam lock on the door so it shuts tighter.  Clean and scrape any creosote from where the damper shuts against the door, also check the damper for pitting or deterioration.

[adamant]

What did u find out?

[MTJAG]

I checked everything and everything is good.  It seems this is only happening when we have strong winds.  If the wind is not blowing, everything works as it should.   When the wind is blowing, I see temps overshoot the 185 set point up to 190.  Again, this only occurs when the wind is over 25mph.  In the mountains, 25 is low wind.

[Roger2561]

I checked everything and everything is good.  It seems this is only happening when we have strong winds.  If the wind is not blowing, everything works as it should.   When the wind is blowing, I see temps overshoot the 185 set point up to 190.  Again, this only occurs when the wind is over 25mph.  In the mountains, 25 is low wind.

For the past 4 years my E-Classic 1400 has gone over the high set point by 5 degrees.  No matter what I tried, it always goes over the high set point by 5 degrees.  As long as it doesn't go any higher than that, I'm not too worries about it.  I it find fascinating that your unit only exceeds the high set point with high winds.  Roger   

[duramax]

Mine was going over. I just scraped the door seal better and that did it for now.

[clydem]

My neighbor had a similar over temp problem in high winds, he did not have a chimney cap on a 3 section chimney.  He added a chimney cap and has not had the problem since.  he also replaced the door gasket before the heating season.

[E Yoder]

I would guess:
that overheating caused by high winds would only occur in a few very specific situations where the terrain creates an updraft during high winds. Maybe 1 out of 10 furnaces. Maybe that's why it is difficult to diagnose. You could probably see the turbulence better during a snowstorm.
For example I have leaves just spinning in a vertical circle on the downwind side if my house when it really blows . The house causes a tumble like a ledge in a river.
If you ever have been in a hydraulic in a river you won't forget it. Surprisingly powerful.

Overheating caused by leaky gaskets or air dampers is much more common.