First ignition start-up

What happens, in order

1. Confirm the gas valve is closed and all electrical connections are wired and grounded.
2. Confirm system pressure is at least 12 psi on the gauge and no heat or DHW calls are active.
3. Power on the boiler with the ON/OFF button. The purge cycle runs automatically.
4. Set the room thermostat to the highest setting to start the boiler and test for Error 501.
5. After Error 501 appears, set the thermostat to normal.
6. Open the gas valve and check all connection seals for leaks.
7. Press RESET to clear Error 501.
8. Start the boiler by selecting CH or DHW.
9. Proceed with the combustion checking procedure.

Timings and thresholds

Codes you may see during this

108 501

Models

More NTI boiler sequences

• Combustion checking procedure · Startup
• Power-on and mode sequence · Startup
• Power-up and what lets the boiler start a call · Startup
• Failed ignition and lockout · Ignition
• Light-off sequence and retries · Ignition
• Central heat call (CH1) from call to satisfied · Heating
• Indirect tank (DHW) call · Domestic hot water
• Circulator outputs and their fuses · Pump/purge