The first step in troubleshooting a gas boiler with a standing pilot lite.
Now before you continue you may need a voltage tester and you will need to know how to use it, if you do not have a voltage meter or you are not sure how to use it, you should stop now and .
The first question is, do you have heat in any section of your home? If
you only have one source of heat in your home (some homes have more then one
boiler) and you have heat in one or more sections of your home, this means
the boiler is firing but for some reason a section of the home is not
getting any heat at all.
Please note: there is a big difference between NO HEAT and LIMITED HEAT. No heat means there is no hot water running through the baseboard or radiators.
Limited heat means you can feel heat on the baseboard or radiator but the room or section of the house is still cold.
To get to the root of your issue, please use The Open Dialog Service.