Bosch BGH96 - 3, 6, & 13 Flashes (Pressure Switch Malfunctions)

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Bosch 96% AFUE Gas Furnace Troubleshooting Guide
01.2019 | BTC 770502101 AData subject to change
3.4 3 Flashes (Low Pressure Switch Stuck Open)
6 Flashes (Pressure Switch Cycle Lockout)
13 Flashes (High Pressure Switch Stuck Open)
Troubleshooting Chart
Start
Yes
Is
the pressure
switch closed?
See Figure 14
& 15.
Is
there blockage
in the pressure hose or
is the hose loose?
See Figure 16.
Are there any
loose wires or wrong
connections?
Correct wiring
according to
the wiring
diagram
Yes
Replace
the
PCB Board
Yes
Remove
blockage or fix
the pressure
hose
No
No
Is there
blockage in the
exhaust pipe?
Yes
Remove
blockage in the
exhaust pipe
No
No
Replace
the
inducer
No
Yes
Replace
the
pressure
switch
Is the
pressure at the
pressure switch correct?
See Figure 17.