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Navien NR-240A heating issues
Hello, thank you for reading my post.
--- First off:
I am a home owner with a little understanding on the setups for tankless and radiant heating, but do not claim to be a contractor or installer. I have been experiencing a lot of issues ever since we moved to a tankless/radiant setup for our home from a tanked/forced air setup about 4 years ago when we did a major home remodel. We had our Navien CR-240A + HeatBox installed by a company that turned out to be incompetent (since has closed for business and under subsequent inspection by reputable installers has been determined to have made a number of mistakes in the pex installation for the raidant heating). However, aside from the installation issues, we have experienced a number of issues with our Navien appliances...
After the initial install of our CR-240A (taps often would not return heated water, we had some leaking from bad fittings, etc.), we had a number of issues that required a complete warranted replacement.
We now have a NR-240A unit and we were excited to have problems behind us. However, we have had repeated issues with the heat level of our domestic water. Each time I call Navien for help, they suggest my issue is related to debris getting into the flow sensor and preventing it from triggering properly. The process to take apart the fitting which holds the flow sensor to "blow" it out clean is arduous, requiring drainage of the system etc., and has not solved the problem.
I have alos checked my HeatBox settings to ensure the temp is set high enough for my domestic supply (set to around 120 degrees). I do have my heater setup with a re-cir on a timer and I dont notice much difference from when the issue happens within or our of the circ running. My replacement unit is now out of the 1 yr warranty as well.
--- Here is the bottom line of my issue:
When we shower, it often starts out moderately warm (not hot) for about 2-3 minutes then goes cold. I have to turn off the hot water service and wait 10 seconds or so then turn back on, after 20 seconds it gets hot again.
My assumption is something (like the flow sensor suggestion from Navien help) is not triggering the domestic heating setting. I have run down to check my unit (in my basement garage) when the issue comes up but find the icon on the LCD with the faucet showing - indicating it sees the call for domestic hot water.
This extreme situation (having to turn on and off) is also fairly recent, it seems like the cold weather might have triggered it? I have wondered if the HeatBox is to blame, or maybe the demand on the radiant system is affecting thins since its more in use with the weather? Before the turn on/off situation our main issue was that it never seemed to reach full temp (the set 120 degrees) - and was a luke warm unsatisfying shower.
Unfortunately the LED read out for temp/status on my HeatBox is starting to fail (faint LED segments) so I am not able to accurately diagnose the temp of water being received in the HeatBox for domestic.
I dread calling Navien again to get help on this as they dont really seem to like home owners calling. The new company that I have servicing my house doesn't work much with Navien and do not really think they are a good line to go with,s o they havent had much to offer. The best advice I get from them is to change the unit out for a more reputable make, which is costly.
--- I know this is a fairly open ended post, but:
I am desperate to find some advice/help on this situation. My hope is that someone here might have a thought on why my setup would be acting this way. I have had a lot of issues with my overall heat setup since my remodel due to the bad install (other issues I wont waste time stating) and this decision has been the worst headache of my home life since my remodel. I now have kids with cold baths and a wife who is fed up - any help appreciated before I have to swallow the bitter pill to buy a new unit.
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