York Gas Furnace: TM9X/TM9E Re: Flashing Code 9 Code 9 = Reversed Polarity or Grounding Problem Qty Possible Causes: No Furnace Ground Reversed Polarity Shorted Flame Sensor Bad Control Board CHECKOUT: 1. Check Line Voltage/Ground Check...

York Gas Furnace: TG9S/GY9S Re: Flashing Code 11 This indicates that a primary or auxiliary limit switch has opened and has remained open for more than five minutes. This condition is usually associated with an air circulation failure. ► Code 11 is a Hard-Lockout which requires cycling...