York Package Units: DNA

Re: No Power on R/Inducer Running Continuous

The is no power between "R" and "C" at the thermostat connection terminals and the inducer motor is running continuous.

CHECKOUT:

1. Check 24V Power Circuit

• At the control board, check for 24VAC between "X" and "C" at the "XFMR" connection.
  • No Power = No Power fro Transformer
• At the 6-Pin connector, check for 24VAC between Pin #1 (204 Or) and "C".
  • Power at XFMR + No Power at Pin #1 = Bad Control Board
• At the 6-Pin Connector, check for 24VAC between Pin #6 (206 Red) and "C".
  • Power at Pin #1 + No Power at Pin #6 = Open Limit Circuit → Step 2. Check Limits
  • Power at Pin #6 + No Power at R = Bad Control Board

2. Check Limits

• Roll-Out Limit
• The Roll-Out limit is mounted above the burners.
• Check for 24VAC between each side of the limit and "C".
  • Power on Both Sides = Limit OK
  • Power on One Side Only = Limit Tripped
• Aux Limit
• The Aux Limit switch should be mounted in the blower compartment.
• Check for 24VAC between each side of the limit and "C".
  • Power on Both Sides = Limit OK
  • Power on One Side Only = Limit Open (Should indicate a bad blower motor).
• Primary Limit
• The Primary Limit is located on the face of the heat exchanger.
• Check for 24VAC between each side of the limit and "C".
  • Power on Both Sides = Limit OK
  • Power on One Side Only = Limit Open
    • Open Limit + Hot Heat Exchanger ⇒ Allow time for limit to cool & recheck (Be cautious of airflow issues).
    • Open Limit + Cool Heat Exchanger = Bad Limit Switch