Dhw Heat Exchanger - Navien NCB-24LSWE Service Manual

4.9.13 DHW Heat Exchanger

Item
Function
Fault
Symptoms
Error codes
Diagnostics
72 NCB Service Manual
Heat transfer between space heating and DHW water. Water heated in the primary and secondary
heat exchangers is circulated to the plate heat exchanger. Also, the plate heat exchanger filters the
water in the space heating system to prevent faults in other parts of the heating system.
1. Water leaks.
2. Low temperature water in the heat exchanger.
DHW leaks and/or temperature fluctuations at hot water outlets.
E016, E030, E353
A leaking plate heat exchanger causes the space heating side system pressure to rise to the tap
water pressure level. Check the pressure in the space heating system.
Description
Version 1.0