York Rooftop Units: ZF, DM Re: Unit Control Board - Diagnostic Codes There are two control boards on this unit. The main unit controller mounted in the electrical control panel and the ignition control board mounted in the burner section. Unit Control Fault Indicators On ...

York Rooftop Units: DH, DM Re: Heat Control Board - Diagnostic Codes There are two control boards on this unit. The main unit controller mounted in the electrical control panel and the ignition control board mounted in the burner section. ► The main unit controller has one diagnostic (Code...

York Rooftop Unit: DH, DM Re: Flashing Code 7 Flashing Code 7 = Compressor 1 Freezestat open. If there is a call for Y1 and the FP1 input is open, the control will lockout stage 1 compressor and flash a code 7. Qty Possible Causes: 1 Bad Freezestat Broken or Loose...

York Rooftop Unit: DH, DM Re: Flashing Code 8 Flashing Code 8 = Compressor 2 Freezestat open. If there is a call for Y2 and the FP2 input is open, the control will lockout stage 2 compressor and flash a code 8. Qty Possible Causes: 1 Bad Freezestat 1 Broken or Loose...

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...

York Rooftop Unit: Predator DH, DM Re: Ignition Control - Flashing Code 3 Flashing Code 3 = Inducer Pressure Switch failed to close or Tripped Roll-out. The vent pressure switch and flame roll-out switch are wired in series. Therefore either switch open on a call for heat will generate a code...

York Rooftop Unit: Predator DH, DM Re: Ignition Control - Flashing Code 6 Flashing Code 6 = Main Limit Switch Open or Aux Limit Switch Open The main limit and auxiliary limit are wired in series. Therefore either switch open on a call for heat will generate a code 6 on the Ignition Control...