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

1 2 | Bosch 96% AFUE Gas Furnace

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.
Data subject to change
Start
Are there any
loose wires or wrong Yes
connections?
No
Does the
resistance of low fire
No
pressure switch show
as "∞ " ? See Figure
12 & 13
Yes
Replace the
PCB Board
Correct wiring
according to
the wiring
diagram
Replace the
pressure
switch
Troubleshooting Guide
01.2019 | BTC 770502101 A