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ICP · Heat pump

Red TRIP LED Comfort Alert TRIP - Y1 call but compressor not running

High severity ICP N4H3 Heat Pump

What the control is telling you

Thermostat Y1 demand is present at the module but the compressor is not running.

Applies to: ICP N4H3 R-410A split heat pump (manual 428 01 5103 02); Comfort Alert codes apply only to units factory-fitted with the Comfort Alert module

Likely causes

  • Compressor internal protector open
  • Outdoor disconnect open
  • Compressor breaker or fuses open
  • Broken wire or bad connector
  • Low pressure switch open (if fitted)
  • Contactor failed open

Test and repair steps

  1. Warning: Turn off power at the disconnect before checking wiring or contactor.
  2. Check line voltage at the disconnect, breaker and fuses.
  3. Check the contactor pulls in with 24 V on the coil and the contacts close.
  4. Check wiring and connectors to the compressor.
  5. If the compressor is hot, let the internal protector reset.
  6. Check the low pressure switch if fitted.

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Source: ICP N4H3 Installation Instructions 428 01 5103 02, Comfort Alert Diagnostics Codes (Figure 18), p.20. Summarized in our own words; check the original manual for your model.

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For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.