Error Flash Codes; No Flash And No Fan (System Does Not Start Normally) - Bosch BGH96 Troubleshooting Manual
96% afue gas furnace
3-way multipoise condensing gas furnace
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Also See for BGH96:
- Installation, operation and maintenance manual (56 pages) ,
- Installation instructions manual (60 pages) ,
- User's information manual (12 pages)
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Troubleshooting Guide
3 Error Flash Codes
3.1 No Flash and No Fan (System Does Not Start Normally)
Troubleshooting Chart
Replace the
control
No
board
Leave "Park" terminal unused.
BTC 770502101 A | 01.2019
loose wires or wrong
Replace the
No
transformer
Is there
No
sending 18-31V signals?
a blown fuse?
Yes
Yes,
Replace
Heating
the fuse
Is there a
call for heat?
See Figure 5
Yes
Replace
the control
board
No
Start
Are there any
Yes
connections?
No
Is there
power to the unit?
No
See Figure 1
Yes
Is the
transformer
working properly?
See Figure 3
Yes
Is the
PCB Board
See Figure 4
Yes,
Fan Only
Is there a
call for fan?
See Figure 6
No
No
Check the
thermostat
settings and/or
replace the
thermostat
Bosch 96% AFUE Gas Furnace | 7
Correct
wiring
according to
wiring diagram
Is the door
switch working properly?
No
See Figure 2
Yes
Is the blower
access door closed
No
or fixed properly?
Yes
Check the
incoming power
supply at
connection box
Yes
Is there
power to the
circulating fan motor?
See Figure 7
Yes
Replace
the circulating
fan motor
Replace the
door switch
Ensure the
blower access
door is closed
properly
Data subject to change
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