Greenheck DG / DGX with Pilot Ignition (463555 IOM) (Pre-2008) - Manual (Page 35)

35
Troubleshooting
24 Vac between
terminals W1 and X?
Heat Switch (S4) Off
(Turn Heat Switch S4 On)
Heat Switch Not Wired
(Wire Heat Switch S4)
115 Vac between
terminals 102 and 101?
Primary Fuses Blown
(Replace Fuses)
Main Transformer Defective
(Replace Transformer)
115 Vac between
terminals 106 and 101?
High/Low Gas Pressure Switch Tripped
(Correct gas pressure and reset)
(Reference Direct Gas Start-Up Step #2 and #3)
115 Vac between
terminals 104 and 101?
High Limit (HLC) Tripped
(Reset/Replace High Limit HLC)
(Check on cause of control loss)
Continuity between
terminals 107 and 108?
Note: The power light on the flame safeguard should blink
approximately every 5 seconds as it performs
a self-diagnostics check.
115 Vac between
terminals 103 and 101?
Inlet Air Sensor (TS) Holding
(Adjust TS setting -- Reference Blower Start-Up step 6)
Heat Relay (RH) Defective
(Replace Heat Relay RH)
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Airflow Switch (PS) Holding for Proper Air Flow
(Correct airflow across burner)
(Reference Direct Gas Start-Up Step #4)
Yes
At this time the heater should attempt to light
(The pilot light on the flame safeguard should illuminate)
Heater Does Not Operate
Does not attempt to light (No visible spark)
Troubleshooting