Bosch BGH96 - Rapid Flashes (Low Flame Condition)

Troubleshooting Guide Bosch 96% AFUE Gas Furnace | 21
BTC 770502101 A | 01.2019
Data subject to change
3.7 Rapid Flashes (Low Flame)
Troubleshooting Chart
Start
Is the
manifold gas
pressure requirement
being met? See
Table 1
Adjust the gas valve
to ensure manifold
gas pressure meets
the required values
No
Is the
PCB Board
grounded properly?
See Figure 11
Replace
the
PCB Board
No
Yes
Is the
inlet gas
pressure requirement
being met? See
Table 2
Is the
flame sensor dirty
or broken?
Adjust the
inlet gas
pressure
Replace the gas
valve if the
pressure cannot
be adjusted
Yes
No
Clean with
steel wool or
replace the
Flame Sensor
Yes
No
Are
orifices
blocked or clogged?
(check burners)
Yes
No
Yes
Properly
ground the
PCB Board
Remove
the
blockage