Bosch BGH96 - 2 Flashes (Low Fire Pressure Switch Stuck Closed)

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Bosch 96% AFUE Gas Furnace Troubleshooting Guide
01.2019 | BTC 770502101 AData subject to change
3.3 2 Flashes (Low Fire Pressure Switch Stuck Closed)
Troubleshooting Chart
This error could also be caused by a blocked vent.
Check vent for obstructions. If a vent is blocked,
unit's safety protection logic will turn off unit.
Start
Are there any
loose wires or wrong
connections?
Correct wiring
according to
the wiring
diagram
Yes
No
Does the
resistance of low fire
pressure switch show
as “∞ ” ? See Figure
12 & 13
No
Replace the
pressure
switch
Yes
Replace the
PCB Board