Description
The Rinnai 104000263 is an OEM printed circuit board (PCB) kit engineered as a direct replacement for Rinnai tankless water heater models RU80, RU98, RUC80, RUC90, RUC98, and C1. The PCB serves as the central control brain of the unit, managing ignition sequencing, temperature regulation, error diagnostics, and communication between system components. Replacing a failed or degraded circuit board with this genuine Rinnai kit restores full factory functionality and ensures continued safe, efficient operation of your tankless water heater.
As an OEM-sourced replacement part, this kit is designed to integrate seamlessly with the listed Rinnai condensing and non-condensing tankless water heater models, eliminating compatibility guesswork and reducing installation time for qualified technicians.
Key Features
- Genuine Rinnai OEM replacement PCB kit
- Compatible with Rinnai RU80, RU98, RUC80, RUC90, RUC98, and C1 tankless water heater models
- Restores full electronic control and diagnostic functionality
- Manages ignition sequencing, temperature control, and system communication
- Direct drop-in replacement for simplified installation
- Supports continued safe and energy-efficient operation
Compatible Models
- Rinnai RU80
- Rinnai RU98
- Rinnai RUC80
- Rinnai RUC90
- Rinnai RUC98
- Rinnai C1
Application
This PCB kit is intended for use by licensed HVAC and plumbing technicians performing warranty or out-of-warranty repairs on Rinnai residential and light commercial tankless water heating systems. Always consult the unit’s service manual and follow all applicable local codes and manufacturer guidelines during installation.
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