Coleman Furnace Error Codes

All Coleman furnace error codes with step-by-step troubleshooting, multimeter specs, and OEM part numbers.

1 error codes

Code	Meaning	Severity	Difficulty
3 Flash Code	The control board powered up the inducer motor but the pressure switch never closed, meaning it didn't detect enough vacuum in the flue system. That switch is basically confirming 'yes, exhaust is actually moving out of the house' before the gas valve opens. No confirmation, no gas, no heat. highintermediate	high	intermediate