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Bosch 96% AFUE Gas Furnace Troubleshooting Guide
01.2019 | BTC 770502101 AData subject to change
No Flash and No Fan (System Does Not Start Normally)
Figures & Tables
Figure 1
1. Check for 115Vac power supply between L1 and common terminal
1
Figure 2
1. Power off.
2. Press in the door switch.
3. Use a multi-meter to measure the resistance.
If it is 0 Ω, then the door switch is ok.
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3
Figure 3
1. Check for 18-31Vac power between these 2 terminals with multi-meter.
1
Figure 4
1. Check for 18-31Vac power between “R” & “C” terminals with multi-meter.
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