Navien NCB-24LSWE, Service Manual

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96 NCB Service Manual Version 1.0
5.2.6 Error 030
Error occurrence conditions and check items
Error Description
E030
Exhaust gas
temperature
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.
1. When the controller detects the exceeding temperature of 110°C for 10 minutes or more "E030" is
displayed and a post-purge will be performed.
→
Automatically cleared.
2. When the controller detects the exceeding temperature of 60°C while performing post-purge.
→
Manually cleared.
3. When the controller detects the exceeding temperature of 110°C for 10 seconds or over three times
or more after the error is automatically cleared.
→
Manually cleared.
Check items
1. Check if the overheat controller operates normally.
2. Check if the PCB works properly.