Flame rod and electrode kit part numbers are model-specific, not universal across a brand’s whole lineup. Ordering the wrong one is a common, avoidable mistake — always confirm against your unit’s model plate before buying.
Step-by-Step Diagnosis
- DIY SAFE
Find your exact model number on the unit’s rating plate
Not just the brand — the specific model and, where relevant, the series (A2/S2 for Navien). - DIY SAFE
Cross-reference that model against the part number before ordering
Retailer listings usually state which models a given kit fits — read the fitment note, not just the photo. - DIY WITH CAUTION
Buy from a listing that states the fitment explicitly rather than guessing from a photo
Flame rods can look visually similar across models while not being interchangeable.
Parts
| Part | Note |
|---|---|
| Rinnai electrode kit | Part number 104000240 |
| Rinnai electrode kit (alternate) | Part number 104000192-K |
| Rinnai electrode kit (alternate) | Part number 104000249 |
| Rinnai electrode kit (alternate) | Part number 105000232 |
| Navien flame rod assembly | Part number 30004680A |
FAQ
Are flame rods interchangeable across brands?
No. Flame rods are not interchangeable between brands and often not across a single brand’s different model series either.
Related guides: Rinnai Code 11 (No Ignition) · Navien Error Code E003 (Ignition Failure)
Written by HotWater Decoded — water heater repair specialists. Technically reviewed by a licensed technician on our team.
Sources
- Part number listings from Ferguson and other plumbing supply retailers for Rinnai electrode kits
- Amazon listing for the Navien 30004680A flame rod assembly
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