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Troubleshooting code

Back to all WHJ180A(3,4,W)**0***4 error codes

Trane WHJ180A(3,4,W)**0***4 Service output ON troubleshooting

Clogged filter switch active. Use this page to document the issue and prepare for service. GreenFlow should handle diagnosis for electrical, refrigerant, lockout, or recurring conditions.

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What the code means

Service output ON: Clogged filter switch active

The Trane ReliaTel diagnostic-testing article identifies service output ON at RTRM J6-10 as the clogged filter switch being active.

System area
ReliaTel service output
Service level
Service recommended

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.

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Service output ON questions

What does Service output ON mean on a Trane WHJ180A(3,4,W)**0***4?

The Trane ReliaTel diagnostic-testing article identifies service output ON at RTRM J6-10 as the clogged filter switch being active.

What Trane message is associated with Service output ON?

The Trane source used for this page associates Service output ON with "Clogged filter switch active". Match the visible display text, LED pattern, or alert wording to the exact code whenever possible.

What system area does Service output ON point to?

This code is grouped under reliatel service output in the source-backed Trane troubleshooting data.

Which Trane documentation supports this Service output ON page?

Source-backed Trane Commercial HVAC Help Center light-commercial LED code article for ReliaTel/RTRM and related rooftop control diagnostics.

What information should be captured for Service output ON before clearing alerts?

Capture the exact code, any displayed alert text, the model and serial number, thermostat or control status, operating mode, symptoms, and photos of the display or LED pattern before the alert history is cleared.

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