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To aid the troubleshooting process, the UT controller has a LED flash code diagnostic sequence:
Steady Off
No control power
Steady On
Power applied, control OK
1 Flash
Combustion pressure switch open with blower on
2 Flashes
Combustion pressure switch closed with blower off
3 Flashes
Lockout from the three ignition trials
4 Flashes
Lockout from five flame losses
5 Flashes
Control hardware fault detected
6 Flashes
Lockout from five pressure switch losses
6. Troubleshooting Guide.