Dometic 30621 Atwood AFL AC Furnace DSI Ignition Board

Dometic/Atwood 30621 is an AC-furnace direct-spark ignition (DSI) control-board kit in Atwood's Hydro Flame AFL service-parts family. Atwood's manufacturer parts chart identifies 30621 as the AFL AC DSI board kit, distinct from its DC-furnace DSI boards. This is an ignition-control component, not a furnace motor-speed controller.

Board identification

• Exact manufacturer part number: 30621
• Component: DSI ignition-control circuit board / AFL AC service kit
• Furnace electrical family: AC-model AFL; verify the board's actual input and wiring at the furnace
• Approximate board dimensions: 5-1/8 x 3-1/2 inches, per the original supplier specification
• Condition: New

AFLA model references

Model-specific furnace parts diagrams list 30621 for selected AFLA35 and AFLA40 AC furnace configurations:

• AFLA35: AFLA35211, AFLA35221 and AFLA35231
• AFLA40: AFLA40211, AFLA40221 and AFLA40231

These references do not guarantee the same control board for every manufacturing revision. The manufacturer also catalogs other AFL AC board versions, including 32354, and separate DC-system board kits. Compare the exact original part number, AC/DC furnace version and connector arrangement before selecting this replacement. A similar-looking board is not proof of interchangeability.

DSI controls are part of the furnace ignition and flame-safety system. Have the failure diagnosed and the board installed using the correct furnace service instructions by a qualified RV furnace technician. Do not bypass safety switches or gas controls.