Navien NPE-240A Service Manual

Troubleshooting 83
5.1.3 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”~ 13.0" W.C)
2. Check the Gas meter Capacity.
3. Tighten the ground connection screws on heat exchanger.
* Check the flame detection
AD value for proper resistance.
(r
efer to page 42~43)
4. Check if the gas orifice is clogged.
5. Check if the PCB is working properly.
Check connector
(#1 of CON10)
see page 52 for Wiring Diagram
Check the gas pressure
Gas Pressure
Natural Gas: 3.5” - 10.5” W.C.
LP Gas: 8.0" - 13.0" W.C.
NO
Yes
Does the
water heater have
sufficient gas
pressure?

Navien NPE-240A Specifications

General

Type	Tankless
Fuel Type	Natural Gas or Propane
Energy Factor	0.97
Energy Efficiency	97%
Voltage	120V
Ignition Type	Electronic
Maximum Input	199, 900 BTU/h
Water Connection Size	3/4"
Gas Connection Size	3/4"
Warranty	15-year on heat exchangers, 5-year on parts, 1-year on labor
Dimensions	17.3" W x 13.2" D x 27.4" H