I called a number of Central Heating contractors and also Uponor, the company that makes the controller.
I was told that the clicking noise comes from the soft-fuses inside the controller trying to reset. They said box has failed and needs to be replaced by an electrician. Since the controller is the simplest model in their range, there are no diagnostic LEDs or other features that indicate a fault status, except the clicking noise of the soft-fuse.
The repair should only be about an hours labour plus cost of a new controller box.
I will give this a try.
Physics says that water can not make steam, at sea level pressure under 212 degrees F.
It is also why steam pipes and automobile systems are under pressure, you can hold more heat, when water is under pressure and not have it boil. Pressure cookers cook food faster for the same reason.
The only way to make steam, from water, at 180 F, is to do it under partial vacuum.
To get water to boil at 180 F, you need to reduce the air pressure to about 7.5 psi.
7.5 psi is a column of water about 15' tall.
If a boiler tank, had a 15' tall pipe, filled with water, and caught between a drain trap and the return to the boiler, it would make steam at 180 F.
I have a physics background, and I am not a stationary engineer, well not a train engineer either, to be honest.
Hopefully someone who has actually worked on a boiler system can take this and run with it.
- Note, never pay someone to work on a boiler that thinks the temperature of the water should be below the boiling point of water.
You are better off hiring a competent plumber to work on a storage water heater. You get the same result with fewer parts, faster, and for less money.
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Questions Is the floor a radiant system with the piping in the floor like concrete or under the floor (tubing running under the floor between the joists). It makes a difference. You said the system was steam but if is that would be odd. I am going to say that you mean hot water. One note; a radiant floor heating system has a large lag time, the house does not respond quickly to a thermostat change of a quick weather change. Also if it is a radiant slab system in concrete the slab water temp is rarely above 140 degrees F. I think you need to call a heating expert.( D. George)