30Error - Navien NP-180 Service Manual

5.15. 30Error

Error occurrence conditions and check items.
Error
If the overheat controller on the top of the exhaust duct operates, the system
displays the heat exchanger bimetal overheat message 30E (cleared manually)
30E
othe room controller and the PCB. (Overheat controller operating temperature: 149 )
Exhaust gas
temperature
The boiler switches into Lock-Out, and performs post-purge continuously and
error
operates the pump.
1. Check if the overheat controller operates normally.
Check items
2. 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.
100
NR/NP series service Manual
Replaace HTL
Version 2.0