lennox furnnace early shutdown

Old 03-08-08, 11:45 AM
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lennox furnnace early shutdown

Have a Lennox model G51MP .Unit runs fine for about 5 min. and then shuts off saying that the pressure switch contacts are open due to blockage , can not find any blockage in the discharge pipe or the air supply pipe. Need some help

Last edited by tbenn134; 03-08-08 at 12:22 PM.
Old 03-08-08, 01:21 PM
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What about the vacuum tube coming out of the furnace and going into the switch? Have you tried to make sure the hose is clear and that each fitting at each end is clear? I'm not sure on your furnace as to how the LED knows precisely what is wrong, but have you double-checked to see if you even have 24 volts coming to the pressure switch?

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