The surge protector on a Rinnai Infinity 26i or E-series water heater is a small sub-PCB fitted near the main control board, sitting in the power input circuit ahead of the transformer and the rest of the electronics. Its job is to absorb voltage spikes and power surges before they reach the PCB and transformer, protecting the more expensive components downstream.
Rinnai's own service documentation for the 26i sets out a straightforward diagnostic check: if there's incoming mains voltage at the surge protector but no voltage coming out the other side, the surge protector has failed and needs replacing. Fitting a genuine replacement restores a stable power supply to the transformer and control board, and reduces the risk of surge damage spreading further into the unit.
⚠ Important: Work on the surge protector or any internal electrical components should only be carried out by a Gas Safe registered engineer or suitably qualified professional. Always isolate the power supply before starting work.
Key Features & Benefits
Surge Protection: Absorbs voltage spikes before they reach the PCB and transformer.
Genuine Rinnai Part: Made specifically for Rinnai Infinity 26i / E-series continuous flow water heaters.
Restores Stable Power Supply: Ensures a clean feed to the transformer and internal circuitry.
Sub-PCB Module: Fitted near the main control board as part of the power input circuit.
Diagnostic Reference Point: Rinnai's service documentation uses input/output voltage across this component as a fault-finding check.
Ideal For
Rinnai Infinity 26i / E-series water heaters.
Diagnosing and resolving electrical faults.
Routine water heater servicing and maintenance.
Gas Safe registered engineers and qualified professionals.
Common Problems This Part Will Fix
No Voltage Reaching the Transformer: Fixes the fault Rinnai's own diagnostic identifies as power in but no power out of the surge protector.
Unit Failing to Power Up After a Surge: Replaces a protector that has absorbed a voltage spike and failed, cutting power to the control board.
Intermittent Electrical Faults: Resolves faults linked to unstable power reaching the PCB and internal circuitry.
Damage Following Mains Fluctuations: Restores protection after an event (such as a power surge) that may have compromised the original component.
Why Buy This Product?
If your 26i or E-series unit has stopped powering up and you've traced the fault to no voltage leaving the surge protector, this genuine part puts that fix in your hands rather than the fault continuing to sit upstream of the transformer. Because it's the genuine Rinnai component, it fits and performs exactly as the original did, without introducing a weak point back into the power input circuit.
Order the Rinnai Replacement Surge Protector 26i/E online today.
