Green Flow Solution logo
Schedule Service

Troubleshooting code

Back to all DHJ180A(3,4,W)**(L,M,H)***4 error codes

Trane DHJ180A(3,4,W)**(L,M,H)***4 Cooling output Pulsing troubleshooting

Cooling circuit or pressure diagnostic. Use this page to document the issue and prepare for service. GreenFlow should handle diagnosis for electrical, refrigerant, lockout, or recurring conditions.

Schedule Service +1 (857) 767-6414

What the code means

Cooling output Pulsing: Cooling circuit or pressure diagnostic

The Trane ReliaTel fail-code article identifies cooling output pulsing with high or low pressure switch trips or compressor/cooling-circuit conditions depending on unit configuration.

System area
ReliaTel cooling output
Service level
Call GreenFlow

Safe checks before calling

  • Confirm the thermostat is on, set correctly, and calling for heating or cooling.
  • Check the air filter and visible return-air path for obvious airflow restrictions.
  • Look around the outdoor unit for leaves, snow, ice, or other visible obstructions without opening the cabinet.
  • Take photos of the thermostat, outdoor unit, nameplate, and any visible flash pattern before scheduling service.

When to stop and call GreenFlow

Call GreenFlow if the code repeats, the system is locked out, heating or cooling is not restored, there is ice buildup, electrical odor, unusual noise, or any issue involving pressure switches, sensors, wiring, refrigerant, reversing-valve operation, or warranty coverage.

Share the visible code, model and serial number if available, photos, current symptoms, and whether the issue affects heating, cooling, or both.

Cooling output Pulsing questions

What does Cooling output Pulsing mean on a Trane DHJ180A(3,4,W)**(L,M,H)***4?

The Trane ReliaTel fail-code article identifies cooling output pulsing with high or low pressure switch trips or compressor/cooling-circuit conditions depending on unit configuration.

What should I safely check before scheduling service?

Check thermostat status, filter condition, visible outdoor-unit obstructions, and take photos of the flash pattern and nameplate. Do not open electrical panels or refrigerant-side components.

When should GreenFlow handle this code?

Call GreenFlow if the code repeats, the system is locked out, heating or cooling is not restored, there is ice buildup, electrical odor, unusual noise, or any issue involving pressure switches, sensors, wiring, refrigerant, reversing-valve operation, or warranty coverage.

Need help with this code?

GreenFlow can review the code, photos, equipment access, and symptoms before scheduling the right next step.

Schedule Service Back to product

Brands We Service

Popular cities

Service Areas

Our Happy Customers

John F.

I needed 2 new AC units and decided to go with high efficiency heat pumps. I chose Greenflow because of the equipment they offered, and the price (2nd lowest quote and much cheaper than the average of all quote we received). Their technicians were very detail oriented and...

Michael C.

always available, easy to get a hold of, as a property manager I get lots no heat emergency, usually get to it same day or next day

Terry S.

Excellent service from best tech!

Melissa S.

The repair person came quickly and was super efficient and polite, and showed me what to do next time. He gave my dog a quick pay and was off again.

View All