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To aid the troubleshooting process, the UT controller has a LED flash code diagnostic se-
quence:
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
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