memphisshades Posted October 3, 2022 Share Posted October 3, 2022 (edited) Hello, I have underfloor heating in a new house I have moved into. The 2 copper pipes are hot going to a small white boiler-like box (no display, a possible green led that is not lit, i say possible i do not know if it actually is an led) that has 2 plastic pipes (not heated) going into the ground. There is no heat coming up from the floor though - I guess because the plastic pipes are not hot. The small white boiler-like box is plugged into the mains. I had hoped some members of this forum may be able to help - thanks Edited October 3, 2022 by memphisshades Link to comment Share on other sites More sharing options...
ProDave Posted October 3, 2022 Share Posted October 3, 2022 Can you post a picture or several? I think as a new member you might have to post it to some image hosting service and then provide a link to them. Link to comment Share on other sites More sharing options...
MikeSharp01 Posted October 4, 2022 Share Posted October 4, 2022 Is there anything written on the box? No LED ON indicates not running, is there a thermostat somewhere that is not calling for heat or some time switch set to off? Link to comment Share on other sites More sharing options...
memphisshades Posted October 4, 2022 Author Share Posted October 4, 2022 There is a thermostat on the wall. It clicks but no heat. I don't know if what I am looking at is an LED or not. What is the purpose of this box? If there are 2 hot copper pipes going to this box and then rubber pipes coming out and going to the floor I don't understand why water needs to first go into the box. Link to comment Share on other sites More sharing options...
ProDave Posted October 4, 2022 Share Posted October 4, 2022 It could be a buffer tank. A picture or 2 would help greatly......... Link to comment Share on other sites More sharing options...
dpmiller Posted October 4, 2022 Share Posted October 4, 2022 single zone pump set? Link to comment Share on other sites More sharing options...
memphisshades Posted October 5, 2022 Author Share Posted October 5, 2022 not sure what is meant by zones but the floor is heated in a hallway and room next to the hallway separated by a stud wall Link to comment Share on other sites More sharing options...
memphisshades Posted October 5, 2022 Author Share Posted October 5, 2022 (edited) heres some photos Edited October 5, 2022 by memphisshades wrong image Link to comment Share on other sites More sharing options...
ProDave Posted October 5, 2022 Share Posted October 5, 2022 Is that an electric water heater? Is there anything on it any labels to say make or model number? Can we have a picture further out to show what else is there? Is the hot water working? Link to comment Share on other sites More sharing options...
MikeSharp01 Posted October 5, 2022 Share Posted October 5, 2022 5 minutes ago, ProDave said: Is that an electric water heater? Not sure cables are large enough for much power are they? It looks like some sort of controlled heat exchanger hot water, from some where else (is there anywhere else heat is coming from?) and some sort of valve and pump control the UFH circulation. Can you get the cover off? Link to comment Share on other sites More sharing options...
ProDave Posted October 5, 2022 Share Posted October 5, 2022 Do you feel like unscrewing those 4 (look like allen key head) screws and take a picture of what is inside? Link to comment Share on other sites More sharing options...
memphisshades Posted October 5, 2022 Author Share Posted October 5, 2022 Theres 2 copper pipes that get hot. From what I see the copper pipes flow to the white box unit and 2 plastic tubes that run under the floor. The plastic tubes don't get hot though Link to comment Share on other sites More sharing options...
markc Posted October 5, 2022 Share Posted October 5, 2022 Has to be an heat exchanger and UHF pump Link to comment Share on other sites More sharing options...
memphisshades Posted October 5, 2022 Author Share Posted October 5, 2022 Is what I think is an LED actually an LED? Do you think its as simple as the fuse in the plug needing to be replaced? Link to comment Share on other sites More sharing options...
ProDave Posted October 5, 2022 Share Posted October 5, 2022 I don't think any of us have seen something identical to that so taking the cover off to see inside would help. If you have a spare fuse it would certainly not hurt to try changing the fuse in the plug. Link to comment Share on other sites More sharing options...
Radian Posted October 5, 2022 Share Posted October 5, 2022 1 minute ago, memphisshades said: Is what I think is an LED actually an LED? Do you think its as simple as the fuse in the plug needing to be replaced? Probably some form of indicator, maybe a neon. Definatley worth checking the fuse. I think its an early Indirect Heat Interface Unit (HIU) Link to comment Share on other sites More sharing options...
memphisshades Posted October 5, 2022 Author Share Posted October 5, 2022 I'll try and take the cover off shortly and changing the fuse. Doesn't look too good with the rust does it . . . Link to comment Share on other sites More sharing options...
Radian Posted October 5, 2022 Share Posted October 5, 2022 Something like this inside the case: If so it could be the pump has frozen. Simple as getting a big flat bladed screwdriver and releasing the disc in the centre... Link to comment Share on other sites More sharing options...
markocosic Posted October 8, 2022 Share Posted October 8, 2022 Is this a house or a flat? Private or ex local authority? If that is a heat interface unit on a district heating scheme do be aware that some run at decent (e.g. 10 bar static) pressure and temperature (e.g. 95C) - be careful. Link to comment Share on other sites More sharing options...
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