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It's unlikely to be your insulation; a working radiant heat system can make the place HOT when it's really cold, insulation or no insulation. The pipes could be clogged (was the system filled with hard water?) or one or more of the other valves could have failed, or the thermostats could have failed. Or the pump could have failed.
As to how to resolve it... well, if the pipes are clogged, you've got to unclog them or replace them. Which usually requires access to them. Which you probably don't have. Which is one problem with radiant heat.
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