On Thursday, January 15, 2015 at 11:16:42 AM UTC-5, TomR wrote:
A person named Nahsani recently posted the following on the alt.hvac
newsgroup:

"My two-year old Slantfin Boiler won't heat the house above 65 degrees, and
it's usually at 60 degrees. It'll come on and off randomly for short
periods of time (as short as one second) and over a long period of time,
it may bring up the temp to 65. As another example, I had the (new)
thermostat, which my oil company replaced saying that was the problem, up
to 72 overnight and into the day, and the temp in the house is still 60
degrees. I have also left the thermostat pegged on high for two days with
the same result. The company who installed the boiler doesn't, for some
reason, believe that this problem exists, because when they came, the
house was "warm" i.e. 65 degrees! and the gauges on the boiler were up to
the correct pressure. I have obviously severed business relations with
them, but I still have the problem. Any ideas what might be causing this?"



Who knows. It doesn't make a lot of sense. If it's only coming on and
off for short periods of time, incapable of raising the temp, then that
should be demonstrable when the tech is there, regardless of whether the house
happens to be 65. Just raise the thermostat to 75. What happens?
If the thing is not coming on, not generating proper heat, it should be obvious. Something here doesn't compute. If the OP
has really given the contractor many attempts to fix this new install
and they can't or won't, then I'd call another HVAC company to solve it, then
sue the original company in small claims for what it costs, if necessary.

Any speculation here seems pointless, no indication the poster is DIY,
going to try to fix it himself. One of the easiest things, the thermostat
has already been replaced.