Bosch BGH96 Troubleshooting Manual page 11

Troubleshooting Guide
7 Flashes (System Lock-Out due to Failed Ignition)
8 Flashes (System Lock-Out due to too Many Flame Dropouts)
Figures & Tables
1
1. Check for 9-17Ω between these two terminals with multi-meter.
Figure 8
1. Check for 115Vac power supply between IG and IGN with
multi-meter during preheating sequence.
Figure 9
Natural Gas
Propane Gas
Table 1
Manifold Gas Pressure
BTC 770502101 A | 01.2019
1
Manifold Gas Pressure
3.5 in. W.C.
10 in. W.C.
1
1. Check for 18-31Vac power between "M/HI"&"C" terminals with a
multi-meter
Figure 10
1. Check for proper grounding (green wire).
Figure 11
Natural Gas Minimum: 4.5 in. W.C.
Propane Gas Minimum: 11.0 in. W.C.
Table 2 Inlet Gas Supply Pressure
Bosch 96% AFUE Gas Furnace | 11
1
Inlet Gas Supply Pressure
Maximum: 10.5 in. W.C.
Maximum: 13.0 in. W.C.
Data subject to change