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Atwood 91504 Ignition Control Kit with Electrode for Older RV Water Heaters -- 12V DC, Replaces 91420 and 91606
Atwood 91504 ignition control kit with electrode for older RV water heaters, 12V DC, direct replacement for Atwood 91420 and 91606, NBK 12528K
Atwood Ignition Control Kit With Electrode For Older Water Heaters - Direct Replacement
  
List Price: $120.99
: $86.49
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Part Number: 91504
Manufacturer: Atwood

Quantity in Stock :39

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Atwood 12V DC Direct Replacement Atwood 91504 Ignition Control Kit with Electrode -- For Older RV Water Heaters

Restore reliable gas ignition to your older Atwood RV water heater with this direct-replacement ignition control kit. Designed specifically for units that use a post electrode connection, this kit replaces discontinued modules 91420 and 91606 with a single, ready-to-install solution. Also sold under NBK part number 12528K.

Stop Guessing -- Get the Right Ignition Module the First Time

Older Atwood water heaters equipped with post-style electrode connections are a common source of no-ignition complaints in RV service bays and DIY driveways alike. The control board wears out, the electrode assembly corrodes or cracks, and suddenly you have no hot water. The 91504 kit addresses both failure points in one package.

This kit is purpose-built for water heaters originally equipped with Atwood part numbers 91420 or 91606. If your unit carried either of those modules, the 91504 drops in as a direct replacement -- no splicing, no adapter harnesses, no guesswork on electrode orientation.

Post Electrode Design

Engineered for older Atwood water heater models that use a post-style electrode connection -- not compatible with flat-spade electrode designs.

12V DC Operation

Runs on standard 12-volt DC RV house power. No converter required if your rig has a functioning battery or shore power setup.

Replaces Two Legacy Parts

Single kit replaces Atwood 91420 and Atwood 91606, consolidating two discontinued SKUs into one current, serviceable part.

Kit Includes Electrode

The ignition electrode is included with the control module -- no need to source the electrode separately before you can complete the repair.

What Is Included in the Kit

The 91504 ships as a complete ignition kit:

  • Ignition control module (DSI -- direct spark ignition)
  • Ignition electrode assembly with post-style connector

Hardware for panel mounting may vary by heater model. Verify your existing mounting configuration before installation.

Complete Kit -- No Separate Electrode Purchase Needed
Many ignition control boards are sold without the electrode, forcing a second order and a second wait. The 91504 includes both the control module and the matched electrode so you can complete the repair in one trip.

Compatibility and Fitment

This kit is designed for older Atwood gas RV water heaters that originally shipped with a post-style electrode ignition system. Confirm your existing module carries part number 91420 or 91606 before ordering. If your current board uses a flat-spade or plug-in electrode connector, this kit is not the correct replacement.

Common Atwood water heater series that used the 91420/91606 modules include older G6A and G10 series units. Check the heater's data label inside the access door for the original module part number.

Also Known As: NBK 12528K
This product is distributed and cross-referenced in the aftermarket supply chain as NBK (National Brand Kits) part number 12528K. If your parts supplier lists it under 12528K, it is the same item.

Installation Overview

Replacement of the ignition control module on an Atwood water heater is a common DIY repair for RV owners comfortable with basic 12V wiring and LP gas appliance service. General steps include:

  • Turn off LP gas supply and disconnect 12V power to the water heater before beginning.
  • Remove the exterior access panel to expose the existing control board and electrode.
  • Document or photograph all wiring connections before disconnecting the old module.
  • Disconnect the electrode lead and 12V harness from the old board.
  • Unmount the old module; install the 91504 module in the same location.
  • Reconnect the wiring harness and attach the new electrode with its post connector.
  • Restore gas and 12V power; test ignition before closing the access panel.
Service Tip
While the access panel is open, inspect the burner assembly and thermocouple for corrosion or debris. A clean burner orifice and properly gapped electrode (typically 1/8 to 3/16 inch from the burner) are essential for consistent ignition after module replacement.
LP Gas Appliance Work -- Know Your Limits
If you are not confident working around LP gas components, have this repair performed by a qualified RV technician or a certified LP gas service provider. Always pressure-test gas connections after reassembly and verify there are no leaks before operating the heater.

Part Identification

Atwood Part Number91504
NBK Cross-Reference12528K
Replaces (Atwood)91420, 91606
ManufacturerAtwood (Dometic)

Electrical Specifications

Operating Voltage12V DC
Ignition TypeDSI -- Direct Spark Ignition

Physical Specifications

Shipping WeightApproximately 2 lbs
Electrode Connection StylePost (not flat-spade)
Kit ContentsControl module and electrode assembly

Application

Appliance TypeRV LP gas water heater
Heater GenerationOlder Atwood models with post electrode
Typical SeriesAtwood G6A, G10 and similar legacy units
Fuel TypeLiquid Propane (LP)

Compatibility Verification

Confirm Existing Module IsAtwood 91420 or 91606
Confirm Electrode Type IsPost-style connection
Not Compatible WithFlat-spade or plug-in electrode designs
Important Information -- Read Before Installing
  • This kit is designed ONLY for older Atwood water heaters originally equipped with Atwood 91420 or 91606 ignition modules using a post-style electrode. Verify your module part number before purchase.
  • Not compatible with water heaters that use flat-spade or plug-in electrode connectors.
  • Always shut off LP gas supply and disconnect 12V power completely before removing or installing any ignition control component.
  • LP gas connections must be leak-tested after reassembly before the heater is returned to service.
  • If you are unsure about working with LP gas appliances, have the repair performed by a qualified RV service technician or certified LP gas professional.
  • NBK 12528K and Atwood 91504 refer to the same product. Do not order both -- they are identical.


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