What to do if my Nova Florida Boiler has shut down and red light no. 4 is flashing?
- AAndrew HarrellAug 4, 2025
If your Nova Florida boiler has shut down and red light no. 4 is flashing, the issue could stem from: * A faulty flue pressure switch: Check the flue pressure switch and replace if necessary. * Disconnected or faulty silicone pipes: Reconnect or replace the silicone pipes. * Insufficient air intake or flue gas discharge: Check, unclog or replace the air/flue gas ducts as needed. * A faulty fan: Replace the fan. * A faulty PCB: Replace the PCB. * Clogged air/flue system: Check the flue gas exhaust and air intake vent grilles in the boiler room. * A faulty flue gas thermostat: Replace the flue gas thermostat.



