When checking gas pressure, should the burners be in an on or off position?

When checking gas pressure, the burners should be in the "on" position to obtain an accurate reading. This is because the gas pressure in the system will be affected by the demand, which can change depending on whether the burners are operating or not. When the burners are on, they create a load on the system, allowing a technician to see the pressure as it would be when the equipment is functioning under normal operating conditions.

Having the burners on ensures that the pressure measured reflects the real-world scenario of how the equipment will operate during service. If the burners were off, the reading could indicate a different pressure level that might not represent the performance level of the appliance when it is in use. Therefore, it's critical to have the system operating to assess the performance and safety of the gas pressure accurately.