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“System Sentinel”Troubleshooting Guide
Section 3... the “IGNITION” LED
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| NO |
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| Is the Ignition LED Illuminated? |
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| YES |
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| Is Spark Ignitor operating? |
| The Thermostat has called for | |||||||||||
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Is the Blower |
| Operating? |
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| YES |
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| heat, the Blower is running, and | ||||||||||||||||||||||
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| (Can sparking | be heard?) |
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| 24 VAC power is being supplied to | |||||||||||
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| NO |
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| the Ignition Control Module and | ||||||||
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| YES |
| the ignition sequence will begin. | ||||||||||||
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| NO |
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Is there 120 VAC |
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| The System Sentinel Panel is |
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across Black wire |
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| NO |
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| defective and must be replaced. |
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and White wire of |
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blower? |
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| Is 24 VAC present between the |
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| Gray ground wire and the Red |
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| Is there 24 VAC present | ||||||||||
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| YES |
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| 24 V wire connected to the Igni- |
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| NO |
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| between the common and | |||||||||||||||
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| Is |
| there 120 |
| tion Control Module? |
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| Normally open terminal of | |||||||||||||||||||
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| VAC | between |
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| pressure switch 1? | ||||||||||||
Blower | is |
| the black wire at |
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| YES |
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defective |
| the relay and the |
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and must be |
| white wire on the |
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| YES | ||||||||||||||||
replaced. |
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| transformer? |
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| 1. Remove Ignition Cable and check for |
| NO |
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| NO |
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| YES |
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| good continuity, replace if necessary. |
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| 2. Check Ignitor Electrode(s) gap for proper |
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| Check Con- | |||||||||||||||
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| spacing (1/8” to 5/32”). Correct if neces- |
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| tinuity of the | ||||||||
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| sary. |
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| Check con- | Red wire from | ||||||||
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| 3. Examine Ceramic Insulator on Pilot | |||||||||||||
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| Check continuity |
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| the | Ignition | ||||||||||||||||||||
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| Check continuity | tinuity | of | |||||||||||||||||||||||||
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| Assembly for cracks. Replace if cracks | ||||||||||||||||||||||||||
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| of black wire to |
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| Module to | |||||||||||||||||||||||||
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| of black wire from |
| are evident. |
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| yellow wires | |||||||||||||||||||||
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| the Pressure | ||||||||||||||
YES |
| relay. |
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| relay to blower |
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| to pressure | |||||||||||||||
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| Switch. | ||||||||||||||||||
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| Is continuity |
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| motor and white | If all of the above components check okay, | s w i t c h e s | |||||||||||||||||||||
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| wire to motor. | replace Ignition Control Module. |
| and between | Is continuity | ||||||||||||||||||||
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| good? |
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| switches. |
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| Is continuity |
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| good? | ||||||
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| Pressure Switch |
| Is continuity |
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C h e c k |
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| NO |
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| good? |
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wire con- |
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| is defective and | YES | good? |
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| must be replaced. |
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nections. |
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| W i r e |
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| YES |
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| NO |
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| YES | ||||||||||||
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| is | defec- |
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| Is there 120 VAC between the |
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| tive and |
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| must | be |
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| black wire on the relay (power |
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| replaced. |
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| going to blower) and the white |
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| Wiring harness is defec- |
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| wire of the transformer? |
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| tive and must be replaced. |
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| NO |
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| YES |
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Relay is |
| Is 24 |
| Recheck all connections, | |
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| should have power at blower motor. | |||
d e fe c t i v e | YES | VAC present |
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and must be | across coil |
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| Review pressure switch circuit | ||
replaced. |
| of relay? | NO |
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| on this page. | |||
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P o w e r should be at 24 VAC of Ignition Module.
!CAUTION
Label all wires prior to disconnection when servicing controls.Wiring errors can cause improper and dangerous operation. VERIFY PROP-
ER OPERATION AFTER SERVICING!
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