Ignition Control Circuit Board Suburban 520741 / 520820 Furnaces

This is a new M.C. Enterprises 521099MC Ignition Control Circuit Board, designed as a direct replacement for Suburban 520741 and 520820 boards and compatible with all Suburban 12 Volt furnaces.

The 521099MC ignition control board restores proper ignition sequence and burner operation in Suburban RV furnace systems operating on 12 Volt DC power. This board will not replace 24 Volt AC boards, ensuring correct application for 12V furnace systems only.

Engineered as a high-quality aftermarket replacement, this circuit board provides dependable performance once the original equipment warranty period has expired. Designed for durability and ease of installation, it is manufactured in the USA and built to meet strict regulatory standards.

Replaces Suburban Part Numbers

• 520741

• 520820

Compatible Suburban Furnace Series & Models

DD-17DSI Series

• All Models

NT Series

• NT-12: NT-12EF, NT-12F, NT-12FC, NT-12L, NT-12LE, NT-12MEF, NT-12S, NT-12SE

• NT-16: NT-16EF, NT-16F, NT-16FC, NT-16L, NT-16LE, NT-16MEF, NT-16S, NT-16SE, NT-16SEQ, NT-16SQ

• NT-20: NT-20L, NT-20LE, NT-20S, NT-20SE, NT-20SEQ, NT-20SQ, NT-20T

• NT-24: NT-24M, NT-24S, NT-24SP

• NT-25: NT-25K

• NT-30: NT-30K, NT-30M, NT-30S, NT-30SP

• NT-34: NT-34S, NT-34SP

• NT-35: NT-35K

• NT-40: NT-40

• NT-42: NT-42S, NT-42T

SF Series

• SF-20: SF-20, SF-20F, SF-20FQ, SF-20Q

• SF-25: SF-25, SF-25F, SF-25FQ, SF-25Q

• SF-30: SF-30, SF-30F, SF-30FQ, SF-30Q

• SF-35: SF-35, SF-35F, SF-35FQ, SF-35Q

• SF-42: SF-42, SF-42F, SF-42FQ, SF-42Q

SFV Series

• SFV-20, SFV-25, SFV-30, SFV-35, SFV-42

SH Series

• SH-35, SH-35F

• SH-42, SH-42F

SHD2542 Series

• All Models

Key Specifications

• Manufacturer: M.C. Enterprises

• Manufacturer Part Number: 521099MC

• Product Type: Ignition Control Circuit Board

• Voltage: 12 Volt DC

• Length: 4 Inches

• Width: 2-5/16 Inches

• Application: Suburban 12V Furnaces Only

Features & Benefits

• Direct Replacement for Suburban 520741 and 520820 Boards

• Compatible with All Suburban 12 Volt Furnaces

• Restores Proper Ignition and Burner Operation

• High-Quality Aftermarket Replacement

• Designed for Performance and Durability

• Easy Installation

• Made in USA

• Limited 1-Year Manufacturer Warranty