Before calling for boiler repair, try these simple troubleshooting tips that could save you time and money. Check that your thermostat is working and that it's on the correct setting. Check the power disconnect switch. Confirm that you have fuel oil or check to make sure the gas control valve to the boiler is open. Bleed your radiators to release excess gas. Reset the boiler. Repressurize your boiler so that the pressure is neither too high nor too low. Check the boiler's fuse/breaker at the electrical panel. If you're uncomfortable checking any of these issues call for service and let a certified technician resolve the issue for you.