LAARS FTHW, FTHF "CASCADING" . Circuit Board Revisions (SFN)

LAARS FTHW, FTHF "CASCADING" . Circuit Board Revisions (SFN)

LAARS FTHW, FTHF "CASCADING" Circuit Board Revisions (SFN) 

It is IMPERATIVE  that all boilers circuit boards in the cascade have the SAME EXACT revision(SFN) .  Meaning you can NOT mix revisions (SFN's) in a cascade. 

In example,  you can NOT properly cascade a revision 10 (SFN) with a revision 1.01 (SFN). 
ALL REVISIONS (SFN's) MUST BE THE SAME in a cascade regardless of how many boilers are cascaded. 

Furthermore for example,  if down the road,  a circuit board must be replaced , we MUST assure that the remaining circuit boards in the cascade ALSO have the same revision (SFN) as the recently replaced circuit board. 

    • Related Articles

    • LAARS FT 301/399 Cascading Instructions

      LAARS FT 301/399 Cascading Instructions Cascade cables Cascade programming Click on attachment to view

    • FUSES for LAARS FT Circuit Boards

      FUSES for LAARS FT Circuit Boards FT140, FT 199-Combi and Heat Only . Photo below. There are two replaceable glass type fuses mounted on the circuit board. The uppermost (top fuse) is a 10 AMP /125 Volt fuse and is for the 120V circuitry (internal ...

    • Laars MFTCW and MFTHW Circuit Board Part #'s with Revisions and Serial #'s

      Circuit Board Part #'s and Revisions June 3, 2020 KR FLOOR New # Model Old # R2080600 MFTCF140 FT1616 (REV 1.01) SFN# R2080603 MFTCF199 FT1898 (REV 1.01) SFN# COMBI WALL 140 New# Model Old# R2080601 MFTCW140 FT1900 (Serial # F15xxx000-F18xxx308) ...

    • LAARS/Bradford White FT Models Circuit Boards with FT# and R# (current and updated 11/2025).

      LAARS/BRADFORD WHITE FT Circuit Board Part #'s with FT #'s and R#'s. ALL Models and Sizes. Circuit Board Hardware # NGTX= Combi NGTB= Heat only MFTCW140NA1XN Generation 1-Serial # F15000000-F18000308 COMBI WALL 140 CURRENT # MODEL # OLD # PREVIOUS # ...

    • Laars FT Circuit Board Revisions

      Circuit Board Part #'s and Revisions June 3, 2020 KR FLOOR New # Model Old # R2080600 MFTCF140 FT1616 (REV .04) SFN# R2080603 MFTCF199 FT1898 (REV 1.01) SFN# COMBI WALL 140 New# Model Old# R2080601 MFTCW140 FT1900 (Serial # F1500000-F1800308) ...