Error 030 - Navien NCB-24LSWE Service Manual

5.2.6 Error 030

Error occurrence conditions and check items
Error
If the overheat controller on the top of the exhaust duct is initiated, the system displays the heat
exchanger bimetal overheat message 030E (cleared manually) on the front panel.
The boiler switches into Lock-Out, and performs post-purge continuously and operates the pump.
Overheating controller operates when the temperature exceeds 110°C for 10 minutes or over.
E030
1. When the controller detects the exceeding temperature of 110°C for 10 minutes or more "E030" is
Exhaust gas
temperature
2. When the controller detects the exceeding temperature of 60°C while performing post-purge.
error
3. When the controller detects the exceeding temperature of 110°C for 10 seconds or over three times
1. Check if the overheat controller operates normally.
Check items
2. Check if the PCB works properly.
96 NCB Service Manual
displayed and a post-purge will be performed. → Automatically cleared.
→ Manually cleared.
or more after the error is automatically cleared. → Manually cleared.
Description
Version 1.0