No heating

[memphisshades]

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

[ProDave]

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.

[MikeSharp01]

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?

[memphisshades]

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. 

[ProDave]

It could be a buffer tank.  A picture or 2 would help greatly.........

[dpmiller]

single zone pump set?

[memphisshades]

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 

[memphisshades]

heres some photos 

Edited October 5, 2022 by memphisshades
wrong image

[ProDave]

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?  

[MikeSharp01]

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?

[ProDave]

Do you feel like unscrewing those 4 (look like allen key head) screws and take a picture of what is inside?

[memphisshades]

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 

[markc]

Has to be an heat exchanger and UHF pump

[memphisshades]

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? 

[ProDave]

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.

[Radian]

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)

[memphisshades]

I'll try and take the cover off shortly and changing the fuse.  Doesn't look too good with the rust does it . . . 

[Radian]

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...

 

[markocosic]

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.