High Fire Pressure Switch; Low Fire Pressure Switch; Overflow Pressure Switch; Figure 14 - Bosch BGH96 Troubleshooting Manual

Troubleshooting Guide
3 Flashes (Low Pressure Switch Stuck Open)
6 Flashes (Pressure Switch Cycle Lockout)
13 Flashes (High Pressure Switch Stuck Open)
Figures
T he pressure switch that you are checking in this step depends
on the number of LED fl ashes. Refer to the specifi c fl ashes and
their descriptions above.

High fire pressure switch

Overflow pressure switch

Figure 14

1
1. Check for 0Vac between these two terminals with multi-meter.
Figure 15
BTC 770502101 A | 01.2019

Low fire pressure switch

1. Check pressure hose for proper operating condition.
Check for proper hose connections.
Check and remove any blockages in the hose.
Figure 16
High fire
pressure switch
2
Check to see if the pressure at pressure switch is correct by
removing the hose and measuring with a manometer.
(1) Low Pressure Switch Set Point: 0.55 in. WC
(2) High Pressure Switch Set Point: 1.1 in. WC
Figure 17
Bosch 96% AFUE Gas Furnace | 15
1
Low fire
pressure switch
1
Data subject to change