Troubleshooting
Heater Does Not Operate
Does not attempt to light (No visible spark)
24 VAC between | No |
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terminals W1 and X? |
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| Yes |
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115 VAC between | No |
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terminals 102 and 101? |
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| Yes |
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115 VAC between | No |
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terminals 103 and 101? |
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| Yes |
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115 VAC between | No |
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terminals 104 and 101? |
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| Yes |
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115 VAC between | No |
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terminals 106 and 101? |
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| Yes |
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Continuity between | No |
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terminals 107 and 108? |
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| Yes |
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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 Blower
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
High Limit (HLC1) Tripped
(Reset/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 Direct Gas Start-Up – Steps #2 and #3)
Airflow Switch (PS2) Holding for Proper Airflow
(Correct airflow across burner)
(Reference Direct Gas Start-Up – Step #4a or 4b)
At this time the heater should attempt to light.
(The pilot light on the flame safeguard should illuminate).
®
DGX Industrial Space Heating 21
