I have an mobile home...the furnace is an intertherm model # mimb070abw.....the red led light is flashing twice.....it says on the furnace that the "pressure switch is open" was wondering what that meant and also what is a pressure switch??? ( I use LP gas)
from all call for heat from the thermostat a blower is energized which brings air to mix with the gas for burning. However before the gas valve can be energized to open and allow gas to flow the "pressure switch" must switch over to power the gas valve. If the pressure switch will not prove the system will not operate.
There could be a blockage or a plugged condensate line, call a professional to come and diagnose and repair your problem.