Carrier 8000vs advice needed

Old 09-27-11, 06:32 PM
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Carrier 8000vs advice needed

Our carrier 8000vs gas furnace installed 2001 would not turn on at the beginning of fall and the code read 43 low pressure switch. Our friend "blew in the tube" in the low pressure switch and it started again, but later that night switched off again. Then we replaced the low pressure switch. The furnace came back on but turned off after a few minutes. If we hit the reset button it will turn on, but it only runs for a few minutes. Do we have any other options other than calling a pro? Husband thinks something is tripping the "vent reset."
Any advice is appreciated
getting cold aka margaret
Old 09-28-11, 04:26 AM
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Check the vent pipe outside to make sure nothing has gotten in there.

If the pipes can come undone at the furnace, then take a shop vac and blow into the pipe going outside.
Old 09-28-11, 09:36 AM
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ANOTHER perfectly good pressure switch replaced! 98% of the time, pressure switches aren't the problem.
Old 09-28-11, 10:37 AM
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Also check the nipple where the hose from the pressure switch connects to the fan housing. These will often rust internally to the point where the passage is completely occluded. You need to use a series of small drill bits to clear the rust.

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