16Error - Navien NP-180 Service Manual

5.11. 16Error

Error occurrence conditions and check items.
Error
If the overheat controller on the heat exchanger operates during combustion
stop of the boiler, the system displays the 16E (manually cleared) message on the
remote controller and the PCB. The boiler switches into Lock-Out, and performs
16E
Bimetal
postpurge continuously and operates the pump.
overheated
If the overheat sensor signal is detected within 10 min after the combustion is
stopped, no error is displayed, and the system does not start combustion until the
overheat sensor is returned to normal.
1. Check if the main heat exchanger is clogged.
2. Check if the overheat controller works properly.
3. Check the hot water output/input temperature sensor.
Check items
4. Check the PCB DIP S/W capacity setting.
5. Check if the PCB works properly.
Is HTL* normally operation?
Replace PCB
©Navien America Inc. 2010
Description
No
Check the resistance betweenteo white wires of CN 13:
short-circuit(016E)
Check the resistance betweenteo white wires of CN 13:
Yes
short-circuit(030E)
Caution: Measuning should be done at leat 30 minutes
after error.
92
NR/NP series service Manual
Replaace HTL
Version 2.0