Dometic / Atwood 30621 Ignition Control Circuit Board – DSI (AC)

Genuine OEM Replacement

Part Number: 30621
Product Type: Ignition Control Circuit Board (DSI Board)
Voltage: AC
Ignition Type: Direct Spark Ignition (DSI)

Product Overview

The Dometic / Atwood 30621 Ignition Control Circuit Board is a genuine OEM Direct Spark Ignition (DSI) control board designed for select Atwood and Dometic medium-model furnaces operating on AC systems.

This circuit board manages the full ignition sequence — initiating spark, controlling the gas valve, verifying flame presence, and protecting against unsafe conditions. When a board fails, the furnace may not ignite, may lock out repeatedly, or may spark without flame.

Replacing it with OEM Part 30621 restores proper ignition timing, flame sensing, and safe heating performance.

Manufactured to original equipment specifications, this board ensures correct compatibility and dependable operation across listed AFLA and DFLA models.

Key Features

• Genuine OEM Dometic / Atwood replacement part
• Direct Spark Ignition (DSI) control board
• Designed for AC system furnaces
• Controls ignition sequence and flame verification
• Regulates gas valve operation
• Direct replacement for listed AFLA & DFLA models
• Built to original equipment standards

Compatible Furnace Models

Atwood Furnace Models

AFLA35211
AFLA35221
AFLA35231

AFLA40211
AFLA40221
AFLA40231

Dometic Furnace Models

DFLA35211
DFLA35221
DFLA35231

DFLA40211
DFLA40221
DFLA40231

Always verify your furnace model number and confirm it uses an AC DSI ignition system before ordering.

Common Symptoms of a Failed Control Board

You may need to replace the ignition control board if:

• Furnace will not ignite
• No spark during startup
• Burner lights briefly and shuts off
• Furnace enters ignition lockout
• Gas valve not receiving signal
• Intermittent heating operation

The control board is the primary control component for the furnace ignition system.

Product Specifications

Manufacturer: Dometic / Atwood
Part Number: 30621
Component: Ignition Control Circuit Board
Ignition Type: Direct Spark Ignition (DSI)
Voltage: AC
Application: AFLA & DFLA Series Medium Furnaces
Includes: Circuit board only

Frequently Asked Questions (FAQ)

Q: What does a DSI control board do?
A: It generates ignition spark, controls gas valve operation, and verifies flame presence to ensure safe burner operation.

Q: Is this compatible with DC furnaces?
A: No. This listing is specifically for AC system furnaces.

Q: Which furnace models does this fit?
A: It fits the AFLA and DFLA models listed above.

Q: Is this an OEM part?
A: Yes. 30621 is a genuine Dometic / Atwood replacement board.