Suburban Furnace Igniter Control Board | 521099 | 12V | NT/SF

Restore reliable furnace ignition with the Suburban 521099 OEM Furnace Igniter Control Board — 12V DC. Genuine Suburban OEM ignition control board that performs all functions necessary to start and run your furnace. Massive cross-compatibility across NT, SF, SFV, SH, DD-17DSI, and SHD2542 series furnaces — with replacement coverage for 9 legacy Suburban board part numbers.

What This Board Does

The 521099 ignition control board is the "brain" of your Suburban furnace. Powered by 12V DC, it:

• Sends signals to open the gas valve when heat is called for
• Emits a high-output voltage to create the ignition spark that lights the burner
• Manages the safety sequence and shuts down if ignition fails

⚠️ Board Appearance Varies — All Have Correct Connections

Important buyer note: this board has changed appearance over time. Two example images are shown, but the actual board received may differ in visual layout. All variations:

• Include ALL the needed connections
• May have connections in slightly different labeled spots on the board
• Function identically — the electrical performance is the same

If the physical layout looks different from your existing board, look for the connection labels and match by function — every connection you need is present.

Replaces These 9 Legacy Suburban Boards

The 521099 is the current OEM replacement for these superseded board part numbers:

• 230483
• 230587
• 231328
• 231427
• 231741
• 233012
• 520741
• 520820
• 520871

If your existing failed board carries any of these older part numbers, the 521099 is the correct current replacement.

Extensive Furnace Compatibility

Compatible with a wide range of Suburban furnace models across multiple series:

DD-17DSI Series: All models

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

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

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

NT-24 Series: NT-24M, NT-24S, NT-24SP

NT-25 Series: NT-25K

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

NT-34 Series: NT-34S, NT-34SP

NT-35 Series: NT-35K

NT-40 Series: NT-40

NT-42 Series: NT-42S, NT-42T

SF Series:

• SF-20, SF-20F, SF-20FQ, SF-20Q
• SF-25, SF-25F, SF-25FQ, SF-25Q
• SF-30, SF-30F, SF-30FQ, SF-30Q
• SF-35, SF-35F, SF-35FQ, SF-35Q
• SF-42, SF-42F, SF-42FQ, SF-42Q

SFV Series: SFV-20, SFV-25, SFV-30, SFV-35, SFV-42 (all sub-models)

SH-35 Series: SH-35, SH-35F

SH-42 Series: SH-42, SH-42F

SHD2542 Series: All models

Physical Specifications

• Dimensions: 4-1/2" × 2-5/8"

Electrical Specifications

• Power Source: 12V DC

Related Suburban Furnace Components

Companion products for Suburban furnace servicing:

• Suburban 521230 Blower Motor (SF-20/25/30 series)
• Suburban 521255 Motor Kit (SF-35VHQ / SF-35VHFQ)
• Suburban Furnace Bottom Duct Kit (520576)
• Suburban AirXCel 161154 Wall Thermostat

Cross-Reference Part Numbers

• Part Number: 521099
• Replaces: 230483, 230587, 231328, 231427, 231741, 233012, 520741, 520820, 520871

⚠️ Professional Installation Required

Ignition control board replacement involves 12V DC electrical wiring, gas valve connection, and post-install safety verification (ignition sequence, gas leak check). Installation should be performed by a qualified RV service technician.

90-Day Limited Manufacturer Warranty

Genuine Suburban OEM

Key Features

• Genuine Suburban OEM furnace igniter control board
• Part number: 521099
• 12V DC power
• Dimensions: 4-1/2" × 2-5/8"
• Replaces 9 legacy Suburban board part numbers: 230483, 230587, 231328, 231427, 231741, 233012, 520741, 520820, 520871
• Compatible with: DD-17DSI, NT-12/16/20/24/25/30/34/35/40/42 series, SF-20/25/30/35/42 series, SFV-20/25/30/35/42 series, SH-35/42 series, SHD2542 series
• ⚠️ Board appearance may vary — all variations include the same required connections (labels may be in slightly different spots)
• Backed by 90-day limited manufacturer warranty

Specifications

• Brand: Suburban
• Part Number: 521099
• Type: Furnace Igniter Control Board
• Power Source: 12V DC
• Dimensions: 4-1/2" × 2-5/8"
• Function: Gas valve signaling + high-voltage ignition spark generation
• Replaces Boards: 230483, 230587, 231328, 231427, 231741, 233012, 520741, 520820, 520871
• Compatible Series: DD-17DSI, NT (12/16/20/24/25/30/34/35/40/42), SF (20/25/30/35/42), SFV (20/25/30/35/42), SH (35/42), SHD2542
• Warranty: 90-day limited manufacturer warranty