What does 2 flashes mean?
Inducer is running but pressure switch did not close. Blocked condensate or faulty switch.
Common causes
- Clogged condensate drain
- Blocked pressure switch hose
- Failed pressure switch
- Failed inducer motor
Diagnostic & testing steps
- 1. Disconnect and blow clear the pressure switch hose
- 2. Clear condensate drain trap and line
- 3. Test pressure switch with manometer - verify closes at rated inches WC
- 4. Test inducer motor amp draw
- 5. Check for proper flue vent installation
Tools required
- Manometer
- Multimeter
- Shop vac
OEM parts & part numbers
Pressure Switch, Condensate Drain, Inducer Motor Assembly
Part numbers: B1370163, 0130M00000, B1340018
Safety warning
⚠️ Never bypass the pressure switch. It is a combustion safety device.
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