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Is the burner cycling off on high limit? did you or the program turn the thermostat temp down at any point? are all the pipes in the house hot?
What is the LL?
Ok, then you need to get in touch with the LL right away and stay on him until he takes care of this. I would imagine the LL would want to get on this given the extreme cold today. He could have some real problems if he delays. Since you have no access to the boiler there's nothing more you ca do
Very unlikely this is a thermostat problem
No way I can know that without access to the boiler.