Trane S8B1A040M3PSCA/C - Troubleshooting; 5.0 Fault Code

70
S8XB-SVX001-1C-EN
DEFINITION:
Flame is sensed when it
should not be sensed.
Is there a drip leg installed
on inlet gas piping per
installaon instrucons?
Using a back-up wrench,
install new gas valve
Check operaon
Inspect gas supply
for leaks and have
gas supplier check
gas quality
Are there signs of
moisture or debris in the
inlet gas screen?
YES
Install drip leg per
Naonal Fuel Gas
Code and
Installaon
Instrucons
YES
NO
Disconnect electrical
power to furnace
5.0 Fault Code
NO
Turn off gas supply!
Remove gas valve
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