Troubleshooting

Heater Does Not Operate (Pilot Ignition)

Does not attempt to light (No visible spark)

24 VAC between

terminals W1 and X?

Yes

115 VAC between

terminals 102 and 101?

Yes

115 VAC between

terminals 103 and 101?

Yes

115 VAC between

terminals 104 and 101?

Yes

115 VAC between

terminals 106 and 101?

Yes

Continuity between

terminals 107 and 108?

Yes

No

No

No

No

No

No

Heat switch (S4) off.

Turn heat switch (S4) on.

Heat switch not wired.

Wire heat switch (S4).

Primary fuses blown.

Replace fuses.

Main transformer (TR4) defective.

Replace transformer.

(Optional) inlet air sensor (TS4) holding.

Adjust TS4 setting.

Reference: Start-Up - Blower, Set-Up Optional Components, pg. 15

Heat relay (RH) defective.

Replace heat relay (RH).

The power light on the flame safeguard should

blink approximately every 5 seconds as it

performs a self-diagnostics check.

High limit (HLC1) tripped.

Reset or replace high limit (HLC1).

Check on cause of control loss.

(Optional) high/low gas pressure switch(es)

(PS3 and PS4) tripped.

Correct gas pressure and reset.

Reference: Start-Up - Direct Gas, Check the Pilot Gas Pressure, pg. 15

Airflow switch (PS2) holding for proper airflow.

Correct airflow across burner.

Reference: Start-Up - Direct Gas,

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

At this time the heater should attempt to light.

The pilot light on the flame safeguard should illuminate.

26Model VSU Make-Up Air

®

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Greenheck Fan 470654 manual Heater Does Not Operate Pilot Ignition, Does not attempt to light No visible spark

470654 specifications

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