What does Day & Night code 2 Flash mean?
Day & Night furnace code 2 Flash means the pressure switch was closed when the control expected it to be open on the supported control family. Confirm the model number and diagnostic chart inside the furnace door before replacing parts.
What causes Day & Night code 2 Flash?
- A pressure switch stuck closed
- A pinched or incorrectly connected pressure hose
- Shorted pressure-switch wiring or a control fault
Can I troubleshoot Day & Night code 2 Flash?
- Turn furnace power off for five minutes and do not bypass or jumper the pressure switch.
- Check only the outdoor vent openings for obvious snow, ice, leaves, or nests before restoring power once.
How much does Day & Night code 2 Flash cost to fix?
A pressure switch replacement typically costs between $175 and $650 nationally.
When should I call a technician?
Call a technician if the code returns; the switch, hose, wiring, and inducer draft need testing.
Sources and model scope
Fault codes vary by model and control board. Confirm the diagnostic chart inside your furnace panel or the official manual before acting.
Scope used here: ICP control boards covered by document 44001202103 and using its 2–10 flash table.
- International Comfort Products: Furnace Control Board Diagnostic Codes
44001202103 · ICP furnace control boards covered by document 44001202103; confirm the control-board label and door chart.
Compiled by Warmlo Editorial · Reviewed August 2026
This is general information, not professional advice. Gas, electrical, and combustion repairs can be dangerous — when in doubt, call a licensed technician.