No floor heat

Wingwang

Hi, we installed a new heat exchanger to fix our hot water problem. That works great but we now have no floor heat in the basement or garage. We appreciate any suggestions please. Thank you

Jamie Hall

Well... that's a bit vague. What type of boiler? What is the heat exchanger for? How are things plumbed and piped? How are they controlled?

Wingwang

Hi Jamie, it’s an NTI boiler and the heat exchanger was replaced to fix our domestic lack of hot water to the taps upon your recommendation after we tried your other suggestions first. 

Wingwang

Wingwang

Not sure if the picture is any help to you, hope so

Jamie Hall

How is the floor heat controlled? I see a circulating pump. Is that running when the floor is needing heat? Does the boiler turn on?

Wingwang

The boiler comes on fine when demanding hot water but does not fire when upping thermostat for floor heat. I’ll include what’s showing on the boiler display  when I turn on the hot water tap tho the 55 increases to 93

Jamie Hall

It would seem that whatever the control is for the boiler for heat isn't telling the boiler. It may be that the thermostat isn't actuating a circulating pump or a zone valve, or that it simply isn't connected where it needs to be. Really need to know what is supposed to control the boiler...

GroundUp

If the boiler isn't firing on thermostat call, there is obviously a control issue. Whether that's a faulty circuit board, bad thermostat, loose wire, we can't say from here. If it were firing and just not heating, I'd suspect an airlock since you just had it open to change the HX.