York Rooftop Unit: DH, DM

Re: Flashing Code 10

Flashing Code 10 = Compressors locked-out due to Low Ambient Temperature

If there is a call for Y1 and the LAS input is CLOSED, the control will lockout all compressors and flash a code 10.

► The LAS (Low Ambient Switch) is mounted to the unit base in the compressor compartment.

CHECKOUT:

1. Check LAS

• Remove the 6-wire (4-Black, 2-Blue) Plug from the control board.
• Check resistance across the two bottom blue wires.
  • No Resistance = LAS Open
  • Resistance = LAS Closed
    • Closed + Warm Temp = Bad LAS