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Navien NCB-240 making repeated creaking / groaning / moaning and knocking with burner off
This morning I heard an odd groaning and knocking sound. Thought it was coming from my neighbor but it was actually from my Navien NCB-240 gas boiler.
I'm waiting for a call back from my maintenance guy but like to short cut the investigation if possible with your help.
- It continually makes a creaking noise for 3 seconds then there are 3 knocks.
- I tried powering off the boiler but it still makes the noise. If I pull the plug the noise goes away.
- I took the cover off to see if I could hear where the noise was coming from. Sounds like the middle or bottom. There is so many different things in there it is hard to tell.
Any ideas what this could be?
Maybe related for a couple weeks I've periodically been getting E109 (abnormal fan operation) codes. I've clean the air filter not that there was much on there but still get the code every few days. Thinking it is the fan but still waiting to hear back from my repair guy. The sound isn't coming from the fan though.