Dometic 91365 RV Water Heater Ignition Circuit Control Board

The Dometic 91365 Circuit Control Board is an OEM replacement DSI control board for select Dometic and Atwood gas/electric RV water heaters. It acts as the central controller for propane operation, coordinating the ignition electrode, gas valve, thermostat, ECO safety circuit, and flame-sensing functions.

When hot water is requested, the board checks the safety circuit, opens the gas valve, and sends power to the igniter. It then monitors the electrode to confirm that the burner flame has been established. A failed circuit board may prevent the water heater from igniting, cause repeated lockouts, or interrupt propane operation even when the other components are working correctly.

The updated 91365 board uses a pin-style wiring connection rather than the older wiring harness that connected directly to the edge of the circuit board. Water heaters equipped with the older 10-position edge connector require the Dometic 92074 adapter, sold separately.

Models It Fits

Current Dometic WH-Series Water Heaters

• Dometic WH-6GEA
• Dometic WH-9GEA XT
• Dometic WH-10GEA
• Dometic WH-16GEA XT

Dometic’s installation documentation confirms that these gas/electric WH-series models use a DSI control board. The WH-9GEA XT has an actual six-gallon tank, while the WH-16GEA XT has an actual ten-gallon tank with an increased effective hot-water capacity.

Legacy Dometic/Atwood Water Heaters

• Atwood GC6AA-10E
• Atwood GCH6A-10E
• Atwood GC10A-4E
• Atwood GCH10A-4E

Published OEM fitment information consistently identifies the 91365 for these four legacy Atwood gas/electric models.

Dometic part number: 91365
Commonly replaces: 93851
Adapter required for some older units: Dometic 92074

This board is not listed for the gas-only Dometic WH-6GA. Verify the water-heater model and connector style before ordering.

Signs You May Need This Part

• The propane burner does not begin its ignition sequence
• The igniter does not spark even though the board is receiving power
• The gas valve does not receive power during an ignition attempt
• The burner ignites but shuts off because the flame is not detected
• The water heater repeatedly enters ignition lockout
• The unit works on 120-volt electric mode but not on propane
• The water heater operates intermittently
• The board’s onboard fuse repeatedly loses continuity
• The circuit board has visible burns, corrosion, or water damage
• The board receives the correct 12-volt input but does not provide the required outputs
• Other ignition components test correctly, but the propane system still does not operate

Control-board symptoms can also be caused by low 12-volt voltage, a failed thermal cutoff, an open thermostat or ECO circuit, poor grounding, damaged wiring, a faulty gas valve, or an incorrectly positioned ignition electrode. Verify power and continuity through the safety circuit before replacing the board.

Estimated Installation Time

Approximately 20 to 45 minutes.

Installation time may be longer when the 92074 wiring adapter is required or when the existing wiring connections are corroded or damaged. Photograph the original wiring and verify the connector arrangement before removing the existing board.