I have a Burnham series 2a gas boiler. This morning we woke up to a temperature of 66 degrees. The set point for the honeywell thermostat is 72 degrees. Since I have been home, the boiler will kick on and shut off when the temp reaches 67. I have increased the set point to 78 degrees and yet it is holding at 67. The thermostat is a RTH230b. I don't have it set for a program. It is set for manual.

Boilers are not a simple thing to trouble shoot for the average person. Best bet is to have in a pro to look system over. Please let me now what they find.