Knowledgebase

YZH - Outdoor Fan Not Operating

Article ID: 743
Last updated: 6 Feb, 2024

Heat Pump: YZH

Re: Outdoor Fan not Operating

YZH heat pumps are equipped with a YorkGuard VI module which monitors and controls unit operation and defrost.

The factory-installed outdoor fan motor is an ECM motor with a remote motor module controlled by a direct 24VAC signal.

  • The motor module receives constant 230VAC power.
  • 24V + (Blue) comes off of the compressor contactor to the motor module.
  • 24V Com (Yellow) comes off of "C" to "L1" and out "ODF" (all on the Yorkguard) to the motor module.
Qty Possible Causes:
Bad Motor/Module
Bad Yorkguard VI
Defrost Mode
1 Stuck Contactor


CHECKOUT:

1. Check Outdoor Unit

  • Make sure the thermostat is set correctly and calling for either Heating or Cooling.
  • Remove the access panel of the outdoor unit.
    • Compressor and Outdoor Fan Operating Correctly → Step 3. Check Compressor Contactor
    • Compressor Operating with No Outdoor Fan ⇒ Continue
      • Check for 24VAC across the Compressor Contactor coil.
        • No Power + Compressor Operating = Stuck Compressor Contactor
        • Power Present + No Outdoor Fan → Step 2. Check Fan Motor

2. Check Fan Motor

  • On theYorkguard VI module, check for 24VAC between "M" (Gray) and "L1" (Yellow).
    • No Power = Bad Wire/Wiring ⇒ Make sure Yellow wire is connected between "C" and "L1".
    • Power Present ⇒ Check for 24VAC between "M" (Gray) and "ODF" (Yellow).
      • No Power = Bad Yorkguard VI or Defrost Mode
      • Power Present + No Outdoor Fan Operation = Bad Motor/Module

3. Check Compressor Contactor

  • Check for 24VAC across the Compressor Contactor coil.
    • No Power + Compressor Operating = Stuck Compressor Contactor
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Article ID: 743
Last updated: 6 Feb, 2024
Revision: 4
Access: Public
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