Lochinvar KNIGHT 81-286 - Manual (Page 43)

3
Troubleshooting
Service Manual
43
Table 3-4 (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface
FAULT DESCRIPTION CORRECTIVE ACTION
Low 24 vac
120 vac input to the main control board has
dropped below 80 vac. • Check 120 vac supply to the transformer.
• Check wiring connections at the low voltage
terminal strip.
• Check the wire size/length to remote devices.
• Replace the transformer.
Watch Dog Error
The main control board has detected an
internal fault.
• Replace the main control board.
Write EEProm
The main control board has detected an
internal fault.
• Replace the main control board.
CRC Parameters
The main control board has detected an
internal fault. • Replace the main control board.
No Error Stored
The main control board has detected an
internal fault. • Replace the main control board.