012Error - Navien NCB-180 Service Manual

5.2.3 012Error

Error occurrence conditions and check items
Error
If the system detects loss of flame during combustion, the system stops supplying fuel, attempts to restart,
E012
counts the incidents of flame loss, and if the incident occurs 20 times consecutively displays 012E (manually
Flame loss
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.
Check items
4. Check if the gas orifice is clogged.
5. Check if the PCB is working properly.
* Check the flame detection
AD value for proper resistance.
(refer to page 42~43)
Does the boiler have
sufficient gas
pressure?
YES
Check connector
(#1 of CON22)
see page 56 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.