The PCB on the Rinnai Infinity A Series is the brains of the operation - the bit that keeps your water heater up and running - from detecting that water's flowing to firing up the ignition, to dialling back the gas valve, giving the combustion fan a bit more or less oomph, and keeping an eye on all the safety systems. It's all run through this single board.
The Infinity A Series range is designed specifically for the UK domestic market - these are ErP A-rated continuous flow gas-fired hot water heaters that promise high efficiency and low running costs, on top of giving you exactly the right temperature water when you need it. And it all comes down to the PCB not working right - if the board develops a fault, the appliance starts to lose control, and without the right diagnosis and a genuine replacement, it just stays dead.
The A Series PCB interface and those dip switches - don't even think about messing with them yourself. Leave it to a qualified engineer - they're the only ones who should be changing those settings. And after you've put in the new board, make sure to get the dip switches configured right - that's got to be done against the specific needs of the installation, including whether you've got a sideways flue diverter fitted and what temperature delivery settings you've set. It's not something that just carries over from the old board.
The PA-700 is a genuine Rinnai PCB designed specifically for the Infinity A Series. It's built to Rinnai's own spec, so it just plugs in and works with the wiring, sensors and control systems on your appliance. As long as you fit it right and get the dip switches configured to match your installation, you're back in business, with the appliance working just as it should. And as always, get a Gas Safe registered engineer to do the work for you.
Important - DIP Switch Configuration Needed After Replacement
Fitting a new PCB is not just a matter of slapping a new board in the Rinnai Infinity A Series. The settings and dip switches have to be sorted by a licensed engineer - and after you've fitted the new board, you'll need to get those settings configured to match the specific needs of the installation - including temperature delivery and whether you've got a sideways flue diverter fitted. Don't mess this up, or the appliance may not work right - or at worst, it might be unsafe. Always double-check the settings and refer to the installation guide.
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Got questions about PCB fault diagnosis or post-replacement dip switch config? Call us - we're here to help
| Brand | Rinnai |
|---|---|
| Part Number | PA-700 |
| Product Type | Printed Circuit Board (PCB) – Main Control Board |
| Compatible Range | Rinnai Infinity A Series (UK Domestic ErP A-Rated) |
| Function | Controls all appliance functions including ignition, temperature regulation, gas modulation, fan speed, servo motors and safety circuits |
| Dip Switch Configuration | Required post-installation — must be set to match specific installation parameters |
| Appliance Type | Continuous Flow Gas Water Heater |
| Part Type | Genuine OEM Replacement |
| Installation | Gas Safe registered engineer required |
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