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Navien boiler short cycling
E5_Farmer
Member Posts: 12
in Gas Heating
When the electric side runs all is normal including DHW. When the propane side kicks on it fires for about a minute or two then kicks off will not push hot water to my three zones for heat but still seems to make DHW.
E271 come up “temperature differential limit”.
I am wondering if some way some how a simple setting got messed up? I was suggested to clean flame sensor but since it’s making DHW does that make sense? I have read through the manual enough to get to menus to see what things are set at but I don’t quite understand the language of setting parameters.
Thank you
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lost circulation through the unit?Br. Jamie, osb
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England0 -
Jamie Hall said:lost circulation through the unit?0
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It is a circulation issue with pumps or controller.0
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Jon_blaney said:It is a circulation issue with pumps or controller.
I just don’t get why it’s work on the electric side and not the propane side0 -
Hard to determine just what goes where, but do I seem to see two separate pumps, one for the electric boiler and one for the Navien? And if I do, is the one for the Navien running? All the valves which should be open are open?Br. Jamie, osb
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England1 -
Jamie Hall said:Hard to determine just what goes where, but do I seem to see two separate pumps, one for the electric boiler and one for the Navien? And if I do, is the one for the Navien running? All the valves which should be open are open?0
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Jamie Hall said:Hard to determine just what goes where, but do I seem to see two separate pumps, one for the electric boiler and one for the Navien? And if I do, is the one for the Navien running? All the valves which should be open are open?0
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Jon_blaney said:I don't see and zone lights on the controller.0
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Jamie Hall said:It's the one directly under the Navien which I'm interested in. Is it running when the Navien is trying to run? What controls it? If it isn't running, why not?0
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Ironman said:You’re not getting flow through the Navien on a space heating call.
More than likely it’s because the circulator below it is not pumping. What’s controlling that?0 -
I switched it over to straight gas and turned up thermostat. It seems to be running exactly how it should right now. But the last two nights when we get “rippled” and it switched to gas and it won’t work correctly.How do you test or make sure those pumps are working?0
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I have been looking online. Supposedly those grundfos pumps have a pretty simple screw on back. Mine is covered with this black plate? Does that plate pry off of am I stuck taking this thing apart?0
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E5_Farmer said:I have been looking online. Supposedly those grundfos pumps have a pretty simple screw on back. Mine is covered with this black plate? Does that plate pry off of am I stuck taking this thing apart?
I wouldn’t take the plate off. What are you wanting to accomplish with the pump?If you put the tip of a screw driver in the center of the label you can hear the pump running if you put your ear to the handle end.1 -
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Make sure all the dip switches and configuration in the Navien are configured correctly. I the Navien boiler pump wired to the zone panel or the boiler? I’d prefer it’s wired to the boiler as well a the DHW pump. That way you can use Outdoor reset for space heat and different temperature for the DHW. Also you can adjust the Ramp rates on the boiler so help DHW economy. You want it to ramp up slowly and down overpump. DHW indirects are usually over pumped and return water comes back well over 135F so efficiency is under 90%.1
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FIXED. THE INLET WATER STRAINER WAS PLUGGED. Simple fixes are the best fixes. Thank you to everyone for commenting0
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