Скачать или смотреть Simple fix for Navien (NCB-240E) 515 error

The boiler suddenly started throwing an E515 error (no modifying error such as 09 ).

It was going through its normal startup sequence ( fans ramping up etc ) and stopped and threw the error.

Replace the circuit board is the standard look up (and something about board communications). I reckoned it was a peripheral device causing the error.

Trawling through Navian videos - I thought a good starting point is to check the filters and condensate drain - Bingo! I was the condensate drain.

Beware - it is under pressure so keep a bucket under the cup (I show that in the video).

The boiler showed the AIR error - I ran the purge & a hot water tap for 15 mins - the error cleared.

Good luch - it is a simple fix!