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Fault Code
Faults 69 - 70
*Call Service*
Fault 71
*Dynamic LFS*
Fault 71
*Limits Complete*
Fault 72
*Dynamic HFS*
Fault 72
*Spec.Func.2*
Fault 73
*Spec.Func.3*
Fault 75
*Flame Proven
Feedback*
Faults 76 - 87
*Accessory Fault*
Fault 88
*Accessory Fault*
Fault 89
*Accessory Fault*
Fault 90
*Accessory Fault*
Faults 91-93
*Accessory Fault
Faults 94 - 104
*Call Service*
Fault 105
*Call Service*
Fault 106
*Call Service*
Fault 107
*Call Service*
Fault 108
*Call Service*
Table 7. Hold and Fault Message Summary. (Continued)
System Failure
Unused faults.
Low Fire Switch closed, High
Fire Switch must be open
(EC/RM 7850 only).
Limit Input (terminal 7) is off
when it should be on (RM7888
only).
High Fire Switch closed; Low
Fire Switch must be open
(EC/RM7850 only).
Special Function 2 Input
(terminal 17) is off when it
should be on (Device specific).
Special Function 3 Input
(terminal 19) is off when it
should be on (Device specific).
Flame Indication Feedback
(terminal 21) either on when it
should be off or off when it
should be on (Device specific).
-
T17 powered without RM
programmed.
T6 and T17 powered.
T7 opens on RM7890 with VPS
Feature
-
-
Relay Module self-test failure.
Relay Module self-test failure.
Relay Module flame signal
crosscheck failure.
Lost E2 or device shipped
unprogrammed.
7800 SERIES S7800A KEYBOARD DISPLAY MODULE
Recommended Troubleshooting
-
1. Check firing rate position switches (usually in Modutrol®
Motor) for proper operation.
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®
Motor) for proper operation.
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
and confirm presence of supply power when Special Function
2 is activated.
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
and confirm presence of supply power when Special Function
2 is activated.
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. Program RM Valve Proving feature
1. Check wiring; only T6 or T17 should be powered.
1. Determine what interrupted terminal 7.
2. Correct any wiring issues.
3. Reset Relay Module.
1. -
-
1. Reset and sequence the relay module.
2. If the fault reappears, remove power from the relay module and
reapply the power; reset and sequence the relay module.
3. If the fault persists, replace the relay module.
-
-
1. Reset control; if fault persists, replace control.
2. If device resets and operates, verify earth grounding practices.
23
65-0090-6
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