Honeywell 7800 Series Product Data page 17

Table 4. Fault Message and Recommended Troubleshooting (continued) .
Fault Code
Fault 34 CTL input was energized at
Control On the wrong time for the
RM7838A. This fault implies
a field wiring error was
made.
Fault 35 Safety relay was off when it
Internal Fault should be on or fuse has
blown.
Fault 36 Main valve terminal was off
Internal Fault when it should be on.
Fault 37 Pilot (ignition) valve terminal
Internal Fault was off when it should be
on.
Fault 38 Ignition terminal was off
Internal Fault when it should be on.
Fault 39 V2S valve terminal was off
Internal Fault when it should be on.
Fault 40 Safety relay was on when it
Internal Fault should be off.
Fault 41 Main valve terminal was on
Main Valve On when it should be off.
Fault 42 Pilot (ignition) valve terminal
Pilot Valve On was on when it should be
(Pilot Valve 1 on- for off.
EC78XX controls)
Fault 43 Ignition terminal was on
Ignition On when it should be off.
Fault 44 V2S valve terminal, used as
Pilot Valve 2 On a pilot, was on when it
should be off.
Fault 45 Low fire interlock switch
Low Fire Sw. Off failure to close or stay
closed.
System Failure
1. Check wiring, correct any errors.
2. Reset and sequence the RM7838A.
3. If fault persists, replace the relay module.
1. Reset and sequence the 7800.
2. If fault persists, replace the relay module.
1. Reset and sequence the 7800.
2. If fault persists, replace the relay module.
1. Reset and sequence the 7800.
2. If fault persists, replace the relay module.
1. Reset and sequence the 7800.
2. If fault persists, replace the relay module.
1. Reset and sequence the 7800.
2. If fault persists, replace the relay module.
1. Reset and sequence the 7800.
2. If fault persists, replace the relay module.
1. Warning! Remove system power, turn off fuel supply.
2. Check wiring, correct any errors.
3. Inspect the Main Fuel Valve(s) and connections. Assure that
switches are functioning correctly and are not jumpered or welded.
4. Reset and sequence the 7800.
5. If the fault persists, replace the relay module.
1. Warning! Remove system power, turn off fuel supply.
2. Check wiring, correct any errors.
3. Inspect the Pilot Fuel Valve(s) and connections. Assure that switch
is functioning correctly and is not jumpered or welded.
4. Reset and sequence the 7800.
5. If the fault persists, replace the relay module.
1. Warning! Remove system power, turn off fuel supply.
2. Check wiring, correct any errors.
3. Inspect the Ignition terminal and connections. Assure that switch is
functioning correctly and is not jumpered or welded.
4. Reset and sequence the 7800.
5. If the fault persists, replace the relay module.
1. Warning! Remove system power, turn off fuel supply.
2. Check wiring, correct any errors.
3. Inspect the Pilot Fuel Valve 2 and connections. Assure that switch
is functioning correctly and is not jumpered or welded.
4. Reset and sequence the 7800.
5. If the fault persists, replace the relay module.
1. Check wiring, correct any errors.
2. Reset and sequence the 7800.
3. Use either the manual motor position to drive the motor to the Low
Fire position, or use the Run/Test Switch option, if available.
Sequence to the Low Fire position and place the switch in the Test
position. Adjust the Low Fire switch while in this state to insure that
it is closing properly.
4. While in the drive to Low Fire state, measure the voltage between
terminals 19 and G (ground). 120 Vac should be present. If not, the
switch adjustment is incorrect and/or the switch is defective and
should be replaced.
5. If steps 1-4 are correct and the fault still persists, replace the relay
module.
7800 SERIES S7800B DISPLAY MODULE
Recommended Troubleshooting
17
(continued)
65-0219—1