016Error - Navien NPE-180A Service Manual

5.1.4 016Error

Error occurrence conditions and check items
Error
If the overheat controller on the heat exchanger is initiated during combustion/standby of the water heater, the
E16
system displays the 016E (manually cleared) message on the front panel. The water heater switches into Lock-
Bimetal overheated
Out, and performs post-purge continuously and operates the pump.
1. Check if the overheat controller is working properly.
Check items
2. Check the hot water temperature sensor. (refer to page 60)
88 NPE Service Manual
* Check resistance value or continuity. (refer to page 59)
Is HTL* normally
operating?
Check the resistance between #1 and #2 of
CON 6: short-circuit
Yes
Is HTL* normally
operating?
NO
Check connector
(#1 and #2 of CON 6)
Description
NO
Replace HTL
* HTL: High Temperature Limit Switch
Measuring should be done at least 30 minutes
after error.
Yes
1 step: Flushing, Clean Filter
2 step: Try to restart
Version 2.21