|
|
| 7800 SERIES RELAY MODULES | ||
|
|
|
|
| |
| Table 3. Hold and Fault Message Summary (continued). |
|
| ||
|
|
|
|
| |
Fault Code | System Failure |
| Recommended Troubleshooting |
| |
|
|
|
|
|
|
Fault 27 | Start Switch was on during | 1. | Start Switch held on too long. |
|
|
*Start Switch On* | PREPURGE (RM7838A, | 2. | Check wiring; verify that Start Switch is correctly connected. |
| |
| RM7838B only). | 3. | Make sure that the Start Switch is functioning properly and that |
| |
|
|
| the switch contacts are free of contaminants. |
| |
|
| 4. | Reset and sequence the relay module to PREPURGE; set the |
| |
|
|
| Run/Test Switch to Test. Make sure there is no power at |
| |
|
|
| terminal 6 during PREPURGE. |
|
|
|
| 5. | If steps 1 through 3 are correct and the fault persists, replace |
| |
|
|
| the relay module. |
|
|
|
|
|
|
| |
Fault 28 | Pilot flame failure. | 1. | Check pilot valve wiring and operation. Correct any errors. |
| |
*Pilot Flame Fail* |
| 2. | Check fuel supply. |
|
|
|
| 3. | Check pilot pressure and repeat pilot turndown test. |
| |
|
| 4. | Check ignition transformer electrode, flame detector, flame |
| |
|
|
| detector sighting and flame amplifier. |
|
|
|
| 5. | If steps 1 through 4 are correct and the fault persists, replace |
| |
|
|
| the relay module. |
|
|
|
|
|
|
|
|
Fault 29 | Lockout Interlock fault. | 1. | Check wiring; correct any errors. |
|
|
*Lockout ILK* |
| 2. | Inspect the fan; make sure that there is no blockage of the air |
| |
|
|
| intake and that it is supplying air. |
|
|
|
| 3. | Make sure that the Lockout Interlock Switches are working |
| |
|
|
| properly and that all switch contacts are free of contaminants. |
| |
|
| 4. | Reset and sequence the relay module to PREPURGE (place the |
| |
|
|
| Run/Test Switch in the Test position, if available). Measure the |
| |
|
|
| voltage between terminals 7 and G (ground). Line voltage |
| |
|
|
| should be present. |
|
|
|
| 5. | If steps 1 through 4 are correct and the fault persists, replace |
| |
|
|
| the relay module. |
|
|
|
|
|
|
| |
Fault 30 | Running Interlock fault. | 1. | Inspect the Running Interlocks, including the Airflow Switch, |
| |
*Running ILK* |
|
| and the connections. | (continued) |
|
|
|
|
| ||
|
| 2. | Make sure that the Running Interlocks, including the Airflow |
| |
|
|
| Switch, are functioning properly and that switch contacts are |
| |
|
|
| free of contaminants. |
|
|
|
| 3. | Reset and sequence the relay module to PREPURGE. Set the |
| |
|
|
| Run/Test Switch, if available, to Test. Measure the voltage |
| |
|
|
| between terminal 7 and G (ground). Line voltage should be |
| |
|
|
| present. |
|
|
|
| 4. | If steps 1 through 3 are correct and the fault persists, replace |
| |
|
|
| the relay module. |
|
|
|
|
|
|
|
|
Fault 31 | Low Fire Interlock Switch | 1. | Check wiring; correct any errors. |
|
|
*Low Fire Sw. Off* | failure to close during RUN | 2. | Reset and sequence the relay module. |
|
|
| (RM7838B only). | 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 Run drive to Low Fire and place in the |
| |
|
|
| Test position. Adjust the Low Fire Switch while in this state to |
| |
|
|
| make sure it is closing properly. |
|
|
|
| 4. | While in Run, drive to Low Fire state, measure the voltage |
| |
|
|
| between terminal 18 and G (ground). Line voltage should be |
| |
|
|
| present. If not, the switch adjustment is incorrect and/or the |
| |
|
|
| switch is defective and needs replacement. |
| |
|
| 5. | Reset and sequence the relay module. If line voltage was |
| |
|
|
| present between the Low Fire Switch and terminal 18 and the |
| |
|
|
| fault persists, replace the relay module. |
|
|
|
|
|
|
|
|
|
|
|
| (continued) | |
13 |