Navien NHB-055 Service Manual

122 NHB Service Manual
Version 1.0
5.2.27 782Error
Error occurrence conditions and check items
Is the wiring from the front panel
properly connected to the PCB?
Reconnect panel to the PCB
1. step: Reset the unit.
2. step: If problem persists,
replace the PCB and Front
Yes
NO
5.2.28 784Error
Error occurrence conditions and check items
Is the wiring from the front panel
properly connected to the Zone
controller PCB?
Reconnect zone controller to the
PCB
1. step: Reset the unit.
2. step: If problem persists,
replace the PCB, Front panel
and zone controller.
Yes
NO

Navien NHB-055 Specifications

General

Brand	Navien
Model	NHB-055
Category	Boiler
Language	English