012Error - Navien NHB-055 Service Manual

5.2.4 012Error

Error occurrence conditions and check items
Error
E012
Flame loss
Check items
92 NHB Service Manual
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.
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?
Yes
Check connector
(#1 of CON22)
See page 63-64 for Wiring Diagram.
Description
No
Check the gas pressure
Gas Pressure
Natural Gas: 3.5" - 10.5" W.C.
LP Gas: 8.0" - 13.5" W.C.
Version 1.0