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| 7800 SERIES RELAY MODULES |
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| Table 3. Hold and Fault Message Summary (continued). | ||
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Fault Code | System Failure |
| Recommended Troubleshooting |
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Fault 68 | Preignition Interlock fault. | 1. | Check wiring; correct any errors. |
*Preignition ILK* |
| 2. | Inspect the Preignition Interlock switches and make sure |
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| they work properly. |
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| 3. | Check fuel valve operation. Valve must close within five |
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| seconds. |
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| 4. | Reset and sequence the relay module. |
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| 5. | During STANDBY or PREPURGE, measure the voltage |
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| between terminal 17 and G (ground). Supply voltage should |
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| be present. If not, the Preignition Interlock switches are |
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| defective and need replacing. |
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| 6. | If the fault persists, replace the relay module. |
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Fault 69 - 70 | Unused faults. | |
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*Call Service* |
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Fault 71 | Low Fire Switch closed, High | 1. | Check firing rate position switches (usually in Modutrol® |
*Dynamic LFS* | Fire Switch must be open |
| Motor) for proper operation. |
| (EC/RM7850 only). | 2. | Check wiring, correct any errors. |
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| 3. | Reset and sequence the relay module. |
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| 4. | If the fault persists, replace the relay module. |
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Fault 71 | Limit input (terminal 7) is off | 1. | Check limits to make sure they are satisfied after resetting. |
*Limits Complete* | when it should be on (RM7888 | 2. | Check electrical connections to terminal 7 of wiring |
| only). |
| subbase. |
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| 3. | Reset relay module. |
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| 4. | If the fault persists, replace the relay module. |
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Fault 72 | High Fire Switch closed; Low | 1. | Check firing rate position switches (usually in Modutrol® |
*Dynamic HFS* | Fire Switch must be open |
| Motor) for proper operation. |
| (EC/RM7850 only). | 2. | Check wiring, correct any errors. |
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| 3. | Reset and sequence the relay module. |
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| 4. | If the fault persists, replace the relay module. |
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Fault 72 | Special Function 2 Input | 1. | Check operation of Special Function 2 of PLC. |
*Spec.Func.2* | (terminal 17) is off when it should | 2. | Check electrical connection to terminal 17 of wiring |
| be on. |
| subbase and confirm presence of supply power when |
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| Special |
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| Function 2 is activated. |
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| 3. | Reset relay module. |
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| 4. | If the fault persists, replace the relay module. |
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Fault 73 | Special Function 3 Input | 1. | Check operation of Special Function 3 of PLC. |
*Spec.Func.3* | (terminal 19) is off when it should | 2. | Check electrical connection to terminal 19 of wiring |
| be on. |
| subbase and confirm presence of supply power when |
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| Special |
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| Function 3 is activated. |
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| 3. | Reset relay module. |
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| 4. | If the fault persists, replace the relay module. |
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Fault 75 | Flame Indication Feedback | 1. | Remove wire to terminal 21 and reset relay module. |
*Flame Proven | (terminal 21) either on when it | 2. | If the fault persists, replace relay module. |
Feedback* | should be off or off when it | 3. | Reconnect wire to terminal 21. If the fault returns, verify |
| should be on. |
| wiring. |
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Fault 76 - 93 | | |
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*Accessory Fault* |
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Fault 94 - 104 | | |
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*Call Service* |
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Fault 105 | Relay Module | 1. | Reset and sequence the relay module. |
*Call Service* |
| 2. | If the fault reappears, remove power from the relay module |
Fault 106 | Relay Module |
| and reapply the power; reset and sequence the relay |
*Call Service* |
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| module. |
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| 3. | If the fault persists, replace the relay module. |
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Fault 107 | Relay Module flame signal |
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*Call Service* | crosscheck failure. |
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(continued)
17 |
