NTI Boiler: Replace the main PCB
Replace the main PCB on a NTI boiler: New main board on the TRX150. Swap it, then set the parameters from the kit sheet. Skip that and it will not run right.
Applies to: TRX150
Common causes of replace the main pcb
- Failed controller board, dead display or no response
- Board damaged by moisture or a power surge
- Parameters left at defaults after the swap
How to fix replace the main pcb: step by step
- Power off first. Fold down the electronics box.
- Unlock the two clips and open the electronics box cover.
- Disconnect the electrical connections, noting where each goes.
- Unhook the controller board and remove it.
- Install the new PCB in reverse order.
- Set all required parameters following the replacement kit instructions.
- Run a full call for heat and confirm normal operation.
Safety: Gas, electrical and refrigerant work must be done by a licensed technician. Turn off power and gas before servicing, never bypass a safety control, and always follow the manufacturer's manual for your exact model.
If the unit shows an error code, look it up: NTI Boiler codes
Source: NTI TRX150 manual, p. 100. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.