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Bosch BGH96
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Troubleshooting Guide Bosch 96% AFUE Gas Furnace | 17
BTC 770502101 A | 01.2019
Data subject to change
4 Flashes (Limit/Rollout Switch Open Less than 5 Mins)
5 Flashes (Limit/Rollout Switch Open More than 15 Mins)
11 Flashes (Limit/Rollout Switch Open from 5 to 15 Mins)
Figures & Tables
Figure 18
1. Chamber mounted limit switch (behind the gas valve)
2. Fan mounted limit switch (side of blower fan, behind PCB board)
1 Chamber mounted limit switch (behind the gas valve)
1
2
Figure 19
1. Check for 0 resistance between these two terminals with multi-meter.
Make sure to do this check on both chamber and fan mounted limit switches.
1
Bosch Model BGH96M060B3A BGH96M080B3A BGH96M080C4A BGH96M100C5A BGH96M100D5A BGH96M120D5A
Rollout switch - resettable °F 300
Inlet High Temperature Limit
switch - fi xed
Off /On °F 150/120 130/100 150/120 150/120 150/120 150/120
Table 3
Figure 20
1. Rollout limit switch locations.
1
Figure 21
1. Power off and check for 0 resistance between these two terminals with
multimeter.
1

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