Heater Boiler? Oil fired boiler keeps popping reset switch. Don't knkow why. Will work...

Oil fired boiler keeps popping reset switch. Don't knkow why. Will work for around couple hours then break will pop. As time go by gets progressively worse popping everyhour consequently half hour.Also the pressure compute is reading zero. Any oblige would be apreciated.I can read volt meters and can understand instructions so don't dally to be too instructive if possible. Thank you.
Does anybody use that ridex thats advertise...
Answers:    first find the phone book
second find heat contractors
third call one to acquire a service tech scheduled to come check it out

dont want to nouns like im putting you down but i.e. the best possible answer