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Flue APS – Closed is Normal, Open is Fault (Condensate Drain Trap)
Press the Power button to clear the Error Code.
- Check FLUE APS and main controller connections. Ensure all are secure.
- Check FLUE APS resistance. If resistance is zero, replace the switch.
- Check FLUE APS hose. Ensure it is connected and in good condition.
- Check exhaust vent for blockages.
- If the problem persists, replace the main control.
