Bosch BGH96 Troubleshooting Manual page 17

Troubleshooting Guide
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
1. Chamber mounted limit switch (behind the gas valve) 1 Chamber mounted limit switch (behind the gas valve)
2. Fan mounted limit switch (side of blower fan, behind PCB board)
Figure 18
1
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.
Figure 19
Bosch Model
Rollout switch - resettable
Inlet High Temperature Limit
Off /On
switch - fi xed
Table 3
BTC 770502101 A | 01.2019
1
2
BGH96M060B3A BGH96M080B3A
— °F
°F 150/120
Figure 20
1. Power off and check for 0 resistance between these two terminals with
multimeter.
Figure 21
BGH96M080C4A
300
130/100 150/120
Bosch 96% AFUE Gas Furnace | 17
1
1. Rollout limit switch locations.
1
BGH96M100C5A BGH96M100D5A
150/120 150/120
BGH96M120D5A
150/120
Data subject to change