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Posted by Harold on March 2nd, 2003 01:15 PM
In reply to RUUD furnace shuts off by Gordon Martin on March 2nd, 2003 12:58 PM [Go to top of thread]

The high limit control suts off the burners to prevent overheating when the air flow is not enough to carry the heat away from the exchanger. That is its purpose. It is usually a sign of inadequate heating duct size creating inadequate air flow or a low fan speed.

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