Product data

7800 SERIES S7800A1142 KEYBOARD DISPLAY MODULE
23 65-0288-1
Fault 72
*Dynamic HFS*
High Fire Switch closed; Low
Fire Switch must be open
(EC/RM7850 only).
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.
Fault 72
*Spec.Func.2*
Special Function 2 Input
(terminal 17) is off when it
should be on (Device specific).
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.
Fault 73
*Spec.Func.3*
Special Function 3 Input
(terminal 19) is off when it
should be on (Device specific).
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.
Fault 75
*Flame Proven
Feedback*
Flame Indication Feedback
(terminal 21) either on when it
should be off or off when it
should be on (Device specific).
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.
Faults 76 - 87
*Accessory Fault*
——
Fault 88
*Accessory Fault*
T17 powered without Valve
Proving feature setup.
1. Follow Valve Proving Selection Setup in Appendix B on
selected Relay Module.
2. If No Valve Proving (NEVER) is required, connect controller
(Demand) to terminal 6.
Fault 89
*Accessory Fault*
T6 and T17 powered at the
same time.
1. Correct wiring error.
Fault 90
*Accessory Fault*
T7 opens on RM7890 with VPS
Feature
1. Determine what interrupted terminal 7.
2. Correct any wiring issues.
3. Reset Relay Module.
Faults 91-93
*Accessory Fault
— 1. —
Faults 94 - 104
*Call Service*
——
Fault 105
*Call Service*
Relay Module self-test failure. 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.
Fault 106
*Call Service*
Relay Module self-test failure. —
Fault 107
*Call Service*
Relay Module flame signal
crosscheck failure.
—
Fault 108
*Call Service*
Lost E2 or device shipped
unprogrammed.
1. Reset control; if fault persists, replace control.
2. If device resets and operates, verify earth grounding practices.
Fault 109
*Call Service*
Negative cycle test failed, earth
ground absent or line voltage
phasing improper.
1. Make sure a good earth ground connection exists at the
installation site and all earth ground connections are complete
and correct.
2. Make sure the relay module and all loads operate at the same
line voltage phase.
3. Reset and sequence the relay module.
4. If the fault persists, replace the relay module.
Table 7. Hold and Fault Message Summary. (Continued)
Fault Code System Failure Recommended Troubleshooting