This is a pressure switch error.
You could have a couple of issues which could cause this code.
There could be a blockage in either the intake or the
exhaust pipes.
The easiest way to check for this is to undo the coupler
on the intake pipe inside the furnace
housing and let it draw in air from the furnace room for a couple of
minutes and see if that is a fix.
I have done the same with the
exhaust, but only for a minute to check for a blockage(as you will
create some CO while operating this way).
The drain sometimes causes problems. I
have had to use a small piece of wire(like a coat hanger) and push
through the fitting at the bottom for the collector box before, where
the hose ties onto the furnace burner box.
If you have a build up of
condensation in the secondary heat exchanger this can cause problems.
The easiest fix for this is to ensure the furnace is sitting with a
slight tilt to the front(like 1/8th inch back to front), so that the
condensate runs to the collector box and out into the drain.
You could
also check to make sure that the vent motor is getting up to
speed (just in case a bearing is getting tight and slowing it down
enough to not let enough flow through to trip the pressure switch.
Use a brad nail and poke out the intake from the blower to the p-switch... and that is probably the issue here.
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