NTI BOILER. No domestic hot water, but heating works fine

Echalk

hello, wondering if anyone has seen this issue before,

I have and NTI150 combo, it supplies hot water to the house and baseboards for heating. Recently I’ve notice that there has been no hot water. I went to check the NTI, the call for hot water comes on, but the sentry flashes t2.2 and then resumes to show temps and back to t2.2 and continues that way, no error codes, it does did constantly, but when there is a thermostat demand, it fires up like normal and then if you try for domestic hot water, it begins firing up like normal and no issues.

this is a video of the repeating sequence

https://imgur.com/a/XU8zr4L

Alan (California Radiant) Forbes

I can’t find anything in the manual that addresses that problem. If no one else responds here, call tech. support in the morning. NTI is a good boiler.

GroundUp

There is no video attached, but this sounds a lot like a 3 way valve failure (I'm not familiar with NTI specifically so they may not even have one, but the symptoms are very similar).