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7800 SERIES S7800A KEYBOARD DISPLAY MODULE
Fault Code
Fault 68
Preignition Interlock fault.
*Preignition ILK*
Faults 69 - 70
Unused faults.
*Call Service*
Fault 71
Low Fire Switch closed, High
*Dynamic LFS*
Fire Switch must be open
(EC/RM 7850 only).
Fault 71
Limit Input (terminal 7) is off
*Limits Complete*
when it should be on (RM7888
only).
Fault 72
High Fire Switch closed; Low
*Dynamic HFS*
Fire Switch must be open
(EC/RM7850 only).
Fault 72
Special Function 2 Input
*Spec.Func.2*
(terminal 17) is off when it
should be on (Device specific).
Fault 73
Special Function 3 Input
*Spec.Func.3*
(terminal 19) is off when it
should be on (Device specific).
Fault 75
Flame Indication Feedback
*Flame Proven
(terminal 21) either on when it
Feedback*
should be off or off when it
should be on (Device specific).
Faults 76 - 93
—
*Accessory Fault*
Faults 94 - 104
—
*Call Service*
Fault 105
Relay Module self-test failure.
*Call Service*
Fault 106
Relay Module self-test failure.
*Call Service*
Fault 107
Relay Module flame signal
*Call Service*
crosscheck failure.
65-0090—4
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Table 7. Hold and Fault Message Summary (Continued).
System Failure
1. Check wiring and correct any errors.
2. Inspect the Preignition Interlock switches and make sure they
3. Check fuel valve operation. Valve must close within five
4. Reset and sequence the relay module.
5. During STANDBY or PREPURGE, measure the voltage
6. If the fault persists, replace the relay module.
—
1. Check firing rate position switches (usually in Modutrol®
2. Check wiring and correct any errors.
3. Reset and sequence the relay module.
4. If the fault persists, replace the relay module.
1. Check limits to make sure they are satisfied after resetting.
2. Check electrical connections to terminal 7 of wiring subbase.
3. Reset relay module.
4. If the fault persists, replace the relay module.
1. Check firing rate position switches (usually in Modutrol®
2. Check wiring and correct any errors.
3. Reset and sequence the relay module.
4. If the fault persists, replace the relay module.
1. Check operation of Special Function 2 of PLC.
2. Check electrical connection to terminal 17 of wiring subbase
3. Reset relay module.
4. If the fault persists, replace the relay module.
1. Check operation of Special Function 3 of PLC.
2. Check electrical connection to terminal 19 of wiring subbase
3. Reset relay module.
4. If the fault persists, replace the relay module.
1. Remove wire to terminal 21 and reset relay module.
2. If the fault persists, replace relay module.
3. Reconnect wire to terminal 21. If the fault returns, verify wiring.
—
—
1. Reset and sequence the relay module.
2. If the fault reappears, remove power from the relay module and
3. If the fault persists, replace the relay module.
—
22
Recommended Troubleshooting
work properly.
seconds.
between terminal 17 and L2(N). Supply voltage should be
present. If not, the Preignition Interlock switches are defective
and need replacing.
Motor) for proper operation.
Motor) for proper operation.
and confirm presence of supply power when Special Function
2 is activated.
and confirm presence of supply power when Special Function
2 is activated.
reapply the power; reset and sequence the relay module.
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