Error - Navien NCB-24LSWE Service Manual

5.2.5 Error 016

Error Conditions and Checklist
Error
If the overheat controller on the heat exchanger is initiated during boiler combustion or standby, the
E016
system displays '016E' (manually cleared) on the front panel. The boiler switches to Lock-out mode and
Bi-metal
performs a continuous post-purge and starts the circulation pump.
overheated
1. Check the overheat controller is working correctly.
* Test the resistance or continuity (refer to page 62).
2. Check the hot water temperature sensor (refer to page 62).
Checklist
3. Test the circulation pump's supply voltage (AC 230 V).
4. Test the resistance at the pump.
94 NCB Service Manual
Description
Version 1.0