What does lock out mean on boiler?
What does lock out mean on boiler? lockout Your boiler has probably gone into 'lockout', which is when it shuts down because it's detected a problem. The good news is that if it's a common fault, you may not have to call in a boiler engineer. The first thing to do when your heating goes out is check the power in your home, and the pressure in your boiler. What causes an oil boiler to lock out? A boiler can lock out for several reasons, such as you've run out of heating oil, there's been a power cut, low pressure...