d1
Goodman Low Suction Pressure / Low Load Condition Detected

Goodman communicating thermostat shows d1 and cooling capacity is limited

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Low refrigerant charge, Restricted airflow across indoor coil (dirty filter or coil), Oversized system running at low load, Faulty suction pressure transducer

How to Fix / Troubleshooting

Safety first: Turn off power before removing panels. Do not connect gauges or adjust refrigerant without proper licensing.

Steps to check:

  • 1. Replace or clean filters: Dirty filters on a Goodman air handler or furnace can cause low suction pressure. Install new filters of the correct size and MERV rating.
  • 2. Inspect indoor coil: If accessible, check the evaporator coil for dust or biological growth. A heavily clogged coil needs professional cleaning.
  • 3. Ensure vents are open: Open all supply and return registers to maximize airflow.

When to call a professional: If d1 persists, a technician must check refrigerant charge, suction pressure, and the pressure transducer operation.

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Repair Difficulty

Medium 3/5

Required Part

Air filter or evaporator coil
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