Greenheck DG Installation, Operation And Maintenance Manual page 30

Troubleshooting
Heater Does Not Operate
Attempts to light, but no flame (Visible spark)
Is the low fire set properly
(Direct Gas Start-Up Step #6)
Yes
Check inlet gas pressure.
(Direct Gas Start-Up Step #1)
Gas pressure between the
minimum and maximum shown
on the direct gas label?
Yes
Air in the gas line?
No
Check burner pressure drop
(Direct Gas Start-Up Step #3)
Pressure drop across the burner
between 0.625 and 0.675 in. wg?
Yes
Proper spark?
Yes
30 Direct Spark Ignition Make-Up Air
No
(Reference Direct Gas Start-Up Step #6)
No
(Reference Direct Gas Start-Up Step #1)
Yes
No
(Reference Direct Gas Start-Up Step #3)
No
With proper airflow, gas pressure and spark,
If problems remain, consult the factory
Adjust the low fire setting
Correct gas pressure
Purge gas line
Adjust burner baffles
Crossed flame and spark wires
(Uncross wires and reconnect)
Incorrect spark plug gap
(Set spark plug gap to 0.062 in.)
Defective spark plug
(Replace spark plug)
the unit should light.
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