HVACopedia

NTI · Boiler

03 04 Too many resets in 15 minutes (more than 5)

High severity TRX

What the control is telling you

Reset limit reached. Auto reset.

Applies to: TRX150

Likely causes

  • Repeated faults

Test and repair steps

  1. Switch the boiler off and back on at the main electrical supply.
  2. Turn off the power to the boiler as noted in the manual.

Models that show this code

5 models in TRX

TRX085TRX110CTRX150TRX199TRX199C

Other codes on the same units

  • 2 P2 Anti-Legionella function not completely finished
  • 03 01 Display EEPROM error
  • 03 02 Communication error GP-GIU
  • 03 03 PCB internal error
  • 03 05 PCB internal error
  • 03 06 PCB internal error
  • 03 07 PCB internal error
  • 03 09 Gas relay check failed

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Source: NTI TRX150 manual, p. 91. Summarized in our own words; check the original manual for your model.

Homeowner looking at this code? See what it means for you and when to call a technician.

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.