Navien NHB-150 Service Manual

92 NHB Service Manual
Version 1.0
5.2.4 012Error
Error occurrence conditions and check items
Error Description
E012
Flame loss
If the system detects loss of flame during combustion, the system stops supplying fuel,
attempts to restart, counts the incidents of flame loss, and if the incident occurs 20 times
consecutively displays 012E (manually cleared) on the front panel.
Check items
1. Measure, with a manometer the gas supply pressure (NG: 3.5” ~ 10.5” W.C, LP: 8”~ 13.5” W.C)
2. Check the Gas meter Capacity.
3. Tighten the ground connection screws on heat exchanger.
4. Check if the gas orifice is clogged.
5. Check if the PCB is working properly.
6. Check the offset of the gas control valve and CO2.
Does the boiler have
sufficient gas pressure?
Check connector
(#1 of CON22)
See page 63-64 for Wiring Diagram.
Check the gas pressure
Gas Pressure
Natural Gas: 3.5” - 10.5” W.C.
LP Gas: 8.0” - 13.5” W.C.
No
Yes

Navien NHB-150 Specifications

General

Model	NHB-150
Category	Boiler
Maximum Input	150, 000 BTU/h
AFUE	95%
Vent Type	Direct Vent
Fuel Type	Natural Gas or Propane
Min. Input (NG)	15, 000 BTU/h
Min. Input (LP)	15, 000 BTU/h
Voltage	120 V
Water Connection Size	1 inch NPT
Gas Connection Size	3/4 inch NPT
Vent Diameter	3"