Navien NHB-055, Руководство по обслуживанию

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82 NHB Service Manual Version 1.0
Error Code Sub Code Function Self-diagnostic / Action
E777 0 Abnormal operation: LWCO(external device)
1. Check the LWCO wiring connection
2. Ensure that the system water level is appropriate.
3. Add make-up water to the system if necessary.
4. Check for proper voltage from connector
(24VAC).
E782 0 Abnormal Main-Panel communication Check the PCB.
E784 0
Abnormal operation: zone controller
communication (external device)
1. Check the zone controller wiring connection.
2. Check the zone controller PCB
3. Check the Main and Panel PCB
If any of the above solutions do not resolve the problem with the Boiler, contact Navien’s Technical department at 1-800-519-8794.
There will be error codes displayed on the front panel and recorded on the PCB board (within the unit) of any problems or failures that occur
with the Boiler.
IMPORTANT
To reset the Boiler, either press the [Reset] button on the front panel or disconnect, then reconnect electrical power to the boiler.