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check the pressure switch

Posted by Andy on February 18th, 2003 06:46 PM
In reply to lennox furnace problem by joe on February 17th, 2003 11:02 PM [Go to top of thread]

You need to monitor the pressure switch using an ohm meter to see if it is opening up. If it opens up , check for a flue restriction. If it stays closed more than likely it is the johnson control, which has a very high failure rate. I would also jump out the stat at the furnace just to make sure it has a call for heat.

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