Radiant means the heat radiates............Water = Hydronic theres hydronic and electric heat systems. Hire A qualified plumber and or lean on your 1 yr new build wrrty. Id start with a thermal imaging test. and inquire w builder or look at your build plans to see what thermal break that was implemented.

Thank you! Yes I should clarify, it's a hydronic system. I appreciate the advice :)

We are about 1.5 years into our house now and unfortunately our builder has been less than responsive even within the first year. Email maybe a month later type of thing.

I'll consider the plumber for sure, just trying to see if it's something easy I'm overlooking.

Mongo, that's a great thought. So on the other side of my bathroom wall is my garage. I wonder if part of the floor in the bathroom is on the garage loop, which is set much lower than my house?? I'll look into it

If the loops have glycol, that should rule out frozen pex. Glycol can be good and bad.

Hope you find an easy answer.

How many loops or zones? Have you traced out which pex tubes go to which room? My radiant floor has 9 loops in 7 zones and each zone has its own circulating pump with a pilot light one it and I can see if it's working.

UPDATE: I tried increasing the heat in the garage to see if part of the bathroom floor (which is adjacent to garage) would heat up, but no dice.

mtvhike - From what I can tell, I have 3 zones (garage, living/dining/kitchen, and master bedroom/bathroom).

Could there be something wrong with the green Taco board? I'm not even too sure what that does, I'm guessing has fuses in there? Maybe a fuse is out?

When I increase the demand for the zone feeding the master bedroom/bathroom, I can feel the far top right (in photo above) 3 hoses heading up. The far right pump seems to be functioning as it's making a whirring sound.

I'm stumped :( Maybe there's no tubing in that part of the bathroom at all? We haven't noticed until recently and unfortunately I don't recall if it was cold or warm last winter. Would be very odd for only part of the bathroom to have tubing though right?

I’m sorry to says but your system looks like the dog’s breakfast. There’s no piping insulation, no labeling, no direction of flow arrows, no balancing valves, no balancing meters or gauges.

Has anyone ever walk you through its design, setup or usage? Do you have a schematic, documentation of its design with flow charts of everything !

Did it ever work properly?

What are all those papers stuck in the top of the Taco Controller; what do they say? Have you read them?

Great photos for a ‘Wall of Shame’. The good news? I’ve seen worse.

Sorry to be so harsh but work like this infuriates me!

IMPO

SR

@Den Rog,

I'm going to apply some logic:

1. All of the zones seem to be operating. There are no "dead zones".

- That rules out closed valves, mostly rules out pumps.

2. Half of bathroom isn't heating. The other half is.

-Either there are no coils under that area

OR

-There are coils, and there is a branch/manifold there and the one portion doesn't have flow through it. It's not possible to have a series coil and one half not heat. That could only happen if there was a branch loop.

3. Assuming for a moment there are coils in place:

-The flow is physically blocked (kinked PEX, for example)

- There is air in that loop that didn't get purged

The only thing you can do anything about without busting up the floor is being sure the system is properly purged of air.

Other than that, you have to decide how important it is to you to fix this. If the floor has to be busted up - you know your builder is going to drag his feet.

Looking at your setup: You said that the master bedroom/bath zone is the furthest to the right. That appears to be broken down into 3 smaller zones on the same circulator. Check the return temp (by feel) and see if all three are warm. If this were my setup and I was looking for a DYI fix before calling in a pro, I'd try closing a valve to one of the loops while that zone is running and see if that forces enough flow through the remaining to purge a possible air bubble. Let it run for a few minutes. I'd then open it back up and close another one. Also let that run for a few minutes. Then make sure they were all open again and see if it resolved the problem. If it was air, you will hear it come through.

Thank you for the recs Jake I'm going to give it a go!

UPDATE:

So the floor randomly is heating now.  I didn't mess with any of the valves in the mechanical room.  The only thing we did was turn down the temperature on the thermostat about 3 degrees because we had a house full of guests the last few days.

The whole floor is nice and toasty now.  Did turning down the temp purge a bubble or something??  Any ideas?  Regardless, super happy it's working now lol

Glad you got it working! Because I have a similar system, one question I have is "what art those things on your third picture attached to each of the 8 PEX tubes? Are they shutoff valves?"

Yes I believe they are shut off valves

""what art those things on your third picture attached to each of the 8 PEX tubes? Are they shutoff valves?""

They can also be used to meter water through the individual loops. Allows you to throttle down flow through some loops and leave others full open.