Honeywell S7800A - Page 23

7800 SERIES S7800A KEYBOARD DISPLAY MODULE
23 65-009 0-6
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Table 7. Hold and Fault Message Summary. (Continued)
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Fault Code System Failure Recommended Troubleshooting
Faul
t
s 69 - 70
*Call Service*
Unused faul
t
s. -
Fault 71
*Dynamic LFS*
Lo
w
Fire Switch closed, High
Fire Switch must be open
(EC/RM 7850 only).
1. Check firing rate position switches (usuall
y
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 71
*Limits Complete*
Limit Input (terminal 7) is off
when it should be on (RM7888
only).
1. Check limi
t
s to make sure the
y
are satisfied afte
r
resetting.
2. Check electrical connections to terminal 7 of wiring subbase.
3. Reset relay module.
4. If the fault persists, replace the relay module.
Fault 72
*Dynamic HFS*
High Fire S
w
itch closed; Lo
w
Fire Switch must be open
(EC/RM7850 only).
1. Check firing rate position switches (usuall
y
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*
S
pecial Function 2 Input
(terminal 17) is off when it
should be on (Device specific).
1. Check operation of
S
pecial 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 activate
d.
3. Reset relay module.
4. If the fault persists, replace the relay module.
Fault 73
*Spec.Func.3*
S
pecial Function 3 Input
(terminal 19) is off when it
should be on (Device specific).
1. Check operation of
S
pecial 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 activate
d.
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
w
ire to terminal 21 and reset
r
ela
y
module.
2. If the fault persists, replace relay module.
3. Reconnect wire to terminal 21. If the fault returns, verify wiring.
Faul
t
s 76 - 87
*Accessory Fault*
- -
Fault 88
*Accessory Fault*
T17 powered without RM
programmed.
1. Program RM Valve P
r
oving feature
Fault 89
*Accessory Fault*
T6 and T17 powered. 1. Check wi
r
ing; onl
y
T6 o
r
T17 should be po
w
ered.
Fault 90
*Accessory Fault*
T7 opens on RM7890 with VPS
Feature
1. Determine
w
hat interrupted terminal 7.
2. Correct any wiring issues.
3. Reset Relay Module.
Faul
t
s 91-93
*Accessory Fault
- 1. -
Faul
t
s 94 - 104
*Call Service*
- -
Fault 105
*Call Service*
Relay Module self-test failu
r
e. 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 failu
r
e. -
Fault 107
*Call Service*
Relay Module flame signal
crosscheck failure.
-
Fault 108
*Call Service*
Lost E2 o
r
device shipped
unprogrammed.
1. Reset control; if fault persis
t
s, replace control.
2. If device resets and operates, verify earth grounding practices.