Name: Navien NHB-150
Brand: Navien
Rating: 5 (1 reviews)

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NHB Service Manual 121

Version 1.0

5.2.26 777Error

Error conditions and Check Items

Is the factory jumper

installed properly on

CN24?

Is the LWCO installed

properly?

Is the output voltage

normal on CN25?

(AC 24V)

Is proper power being

supplied to the LWCO?

Replace the main PCBCheck LWCO

Check the factory

installed jumper

and jumper

connection (CN24)

Check the

connecting

terminals

(CN25)

NoNo

Yes

Check method

Fault Possible Causes Check method

E777

Abnormal factory

installed jumper

1. Check the factory installed jumper and jumper connection.

2. Check the output voltage normal.

Check the output voltage ( Normal voltage : AC 24V)

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