48Error - Navien NP-180 Service Manual

5.26. 48Error

Error occurrence conditions and check items
Error
For an LP model, if a low-gas pressure is detected at high combustion (Stages 2-2
and 3), the system displays 48E (cleared manually).
48E
If fire breaks out 5 times or more and ignition fails during the combustion after the
Gas pressure
low-gas error is detected
error
If the target APS is out of a specific value range during the combustion with the
gas/air rate adjusted.
1. Check the gas supply pressure. LP : 8"(9" 180 Model) ~13.5" W.C
(at dynamic pressure)
Check items 2. Check if the gas pressure sensor hose is damaged.
3. Check if the gas pressure sensor is defective.
4. Check if the PCB works normally.
LPG Gas enough?
Check GPS Or supply Iine
©Navien America Inc. 2010
Description
No
Yes
122
NR/NP series service Manual
Fill the LPG Gas
Version 2.0