Troubleshooting

Heater Does Not Operate (Direct Spark)

Attempts to light, but no flame (Visible spark)

Is the low fire set properly?

Reference: Start-Up - Direct Gas, Set the Minimum Firing Rate, pg. 17

Yes

Check inlet gas pressure.

Reference: Start-Up - Direct Gas,

Check the Supply Gas Pressure, pg. 15

Gas pressure between the

minimum and maximum shown

on the direct gas label?

Yes

Air in the gas line?

No

Check burner pressure drop

Reference: Start-Up - Direct Gas, Check the

Optional High and Low Pressure Switches, pg. 15

No

No

Yes

Adjust the low fire setting.

Reference: Start-Up - Direct Gas, Set the Minimum Firing Rate, pg. 17

Correct gas pressure.

Reference: Start-Up - Direct Gas,

Check the Supply Gas Pressure, pg. 15

Purge gas line.

Pressure drop across the burner between 0.625 and 0.675 in. WC?

Yes

Proper spark?

Yes

No

No

Adjust burner baffles.

Reference: Start-Up - Direct Gas,

Check the Optional High and Low Gas Pressure Switches, pg. 15

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.

With proper airflow, gas pressure and spark,

the unit should light.

If problems remain, consult the factory.

30Model VSU Make-Up Air

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Greenheck Fan 470654 manual Attempts to light, but no flame Visible spark

470654 specifications

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