TM
Installation & Service Manual
13 Troubleshooting (continued)
Table 13E (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Water Heater Interface
FAULT | DESCRIPTION | CORRECTIVE ACTION |
|
|
|
|
| • Establish a draw to remove HW heat from the |
|
| water heater. |
|
| • Verify that the system is full of water and that all air |
|
| has been properly purged from the system. |
|
| • Verify that the water heater is piped properly into the |
|
| heating system. Refer to Section 6 - System Piping |
|
| for the proper piping methods for the Shield water |
Service Blk |
| heater. |
While the unit is in Service Mode, the outlet |
| |
| • Check 120 VAC to the water heater pump motor on | |
| temperature has exceeded 185°F. | a call for heat. If voltage is not present, check the |
|
| |
|
| wiring back to the main control board. Replace the |
|
| main control board if necessary. |
|
| • If 120 VAC is present on a call for heat and the water |
|
| heater pump is not operating, replace the pump. |
|
| • Verify that the water heater pump is set to the proper |
|
| speed or that the water heater pump is the proper |
|
| size. Reference Section 6 - System Piping for water |
|
| heater pump specifications. |
|
|
|
|
| • Check 120 VAC supply to the transformer. |
|
| • Check wiring connections at the low voltage terminal |
Low 24 VAC | 120 VAC input to the main control board has | strip. |
dropped below 80 VAC. |
| |
|
| |
|
| • Check the wire size/length to remote devices. |
|
| • Replace the transformer. |
|
|
|
Watch Dog Error | The main control board has detected an | • Replace the main control board. |
internal fault. |
| |
|
|
|
Write EEProm | The main control board has detected an | • Replace the main control board. |
internal fault. |
| |
|
|
|
CRC Parameters | The main control board has detected an | • Replace the main control board. |
internal fault. |
| |
|
|
|
67 
