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Old 11-10-2013, 11:24 PM   #1
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Navien CH-240 heating problem


In Mar I had an instant-On Navien CH-240 installed with a combined heat for the baseboard heating system and domestic hot water (DHW). The DHW works fine. I'm having a problem with the heating system. I have talked to the Navien Tech Support and it appears the unit is functioning correctly (as seen by the on-board codes built-into the system). However, my baseboard is not being heated. It seems to me there is an air-lock, flow inhibitor, or other blockage to the supply or return lines. The supply side of the unit has heat in the pipe up to the expansion tank (approx 2 ft from Navien unit), but heat does go beyond and the return line is definitely cold. Is it possible that an installed valve has a flow restrictor incorrectly installed?
As an aside, I have bled many a system in general, and specifically this entire system (and each baseboard individually, too); all with no results! By the way, the plumber who installed it is unavailable (long story) to address this problem.
Can anyone help me isolate (and/or fix) this problem?

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Old 11-11-2013, 12:43 AM   #2
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Navien CH-240 heating problem


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Originally Posted by mellenti View Post
In March I had an instant-On Navien CH-240 installed


Quote:
The DHW works fine.
I'm having a problem with the heating system.
Did it EVER work?

Quote:
...the plumber who installed it is unavailable
Can anyone help me isolate (and/or fix) this problem?
Not as well as he could.

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Old 11-11-2013, 08:11 AM   #3
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Navien CH-240 heating problem


Yes, I'm fairly sure it was working originally, but I am not certain. Hey, I know that sounds weird, but after surviving the worst of the winter with space heaters and getting hot water and with the house seemingly warmer... BTW, this is my son's home (he is a Hurricane Sandy victim and he still actually lives in a trailer on his property), and I am now trying to help him get his home back to liveable state.
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Old 11-11-2013, 08:34 AM   #4
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Navien CH-240 heating problem


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Originally Posted by mellenti View Post
I'm fairly sure it was working originally, but I am not certain.
Well, that's where troubleshooting starts.
Otherwise you're still in the install stage.

Just between you and me... is the plumber still waiting for his money? Did he maybe not complete the job waiting for that?
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Old 11-14-2013, 08:35 AM   #5
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Navien CH-240 heating problem


Update.
Original plumber is back in loop and has been working with Navien tech spt. He will be installing a new internal 3-way valve in system in hope that will solve heat-flow problem. Will learn later today if that solves problem. Have some ideas for next step (install Y-strainer, by-pass loop to allow increased pressure to bleed system, etc.), but will wait for today unfolding story...
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Old 11-14-2013, 07:26 PM   #6
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Navien CH-240 heating problem


During the summer I assume you stop the water flowing through your heat fins. As it turns stagnate is this connected directly to your drinking water? Or does your navian have a heat exchanger built in with double wall so that stagnate water cannot enter your drinking water?
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Old 11-15-2013, 08:01 AM   #7
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Navien CH-240 heating problem


Success! System is working properly. Here's how it was solved:
1) On Monday (11/11) plumber - who installed the Navien - tried bleeding the system without success (no surprise as I had done it previously).
2) Talking with Navien's tech spt, the plumber was able to isolate the flow problem to a 3-way flow-valve (within the CH-240).
3) Navien shipped a replacement 3-way and
4) On Thursday plumber installed the new 3-way. Immediately had heat flowing through primary loop and shortly had heat flowing in secondary loop (through the house).
Thanks for everyone's effort's to help.

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