Troubleshooting - Honeywell 7800 SERIES Manual

Fault Code
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 - 87 —
*Accessory Fault*
Fault 88 T17 powered without Valve
*Accessory Fault* Proving feature setup.
Fault 89 T6 and T17 powered at the
*Accessory Fault* same time.
Fault 90 T7 opens on RM7890 with VPS
*Accessory Fault* Feature
Faults 91-93 —
*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.
Fault 108 Lost E2 or device shipped
*Call Service* unprogrammed.
Fault 109 Negative cycle test failed, earth
*Call Service* ground absent or line voltage
phasing improper.
Table 7. Hold and Fault Message Summary. (Continued)
System Failure
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23
7800 SERIES S7800A1142 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 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. 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.
1. Correct wiring error.
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.
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.
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