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Returned to site with replacement dual pressure switch. Upon arrival the system was turned off at the thermostat. Turned to heat mode and went down to the furnace. Found Blower Motor running and unit was in an EE1 Pressure Switch error code. Removed leads from both switches and found one pressure switch was intermittently closing while testing continuity. Reconnected the old pressure switch and tried to replicate issue. Installed new pressure switches and cycled system. Allowed system to run and found no issues. Measured Pressure across the first switch at -1.8” WC with the switch rated for -1.27” WC. The drain switch was pulling around -1.0” WC and it is rated for -0.1” WC. Measured amperage on the inducer motor. Tested combustion and gas pressure.