My Rinnai hot water system is showing an ‘error 31’ code, what does this mean?

An error 31 code on your Rinnai hot water system indicates that there is a fault occurring with the burner thermocouple on your unit. The thermocouple is an electric device that acts as a sensor used to monitor the water temperature within you hot water unit. Having a functioning thermocouple device is essential for your Rinnai hot water system to operate effectively.

What can I do to fix an ‘error 31’ code on my Rinnai unit?

Diagnosing and fixing a thermocouple issue on your hot water unit is not an easy task, however there a few basic troubleshooting steps you can follow to attempt to fix you thermocouple issues on your own.

Firstly, the fire manifold pressure settings need to be checked to ensure they are set at the appropriate levels for your unit. Secondly, check that all of the dip switches are set in the correct position on the unit’s PC board. Finally, you will need to check the milli-volt (mV) reading on the thermocouple to ensure it is in the appropriate range.

Often if the reading is below 8mV on the thermocouple, this indicates that there is low gas pressure leading to the thermocouple. Tthis will require a qualified technician in order to be repaired.

If these troubleshooting steps do not successfully fix your hot water problems, give Metropolitan Plumbing a call on 1300 367 333 and we’ll get it fixed for you.

With years of experience in both general maintenance and emergency plumbing, there little our plumbers haven’t seen or can’t fix. We frequently attend call outs for hot water system issues and can work on all makes and models of gas, electric and solar units.

No matter what the problem is, you can rest east knowing that Metropolitan Plumbing has the experience and expertise to fix it. In the event that your hot water unit cannot be repaired our plumbers can provide you with an onsite quote to supply and install your new unit.

Purchasing a new hot water system is often an unexpected cost and this is why we offer interest free repayment options through Certegy so that you can pay your unit off in affordable instalments.

We understand that plumbing problems don’t just pop up during business hours and this is why we operate 24/7. Metropolitan Plumbing is only a phone call away. We arrive onsite with fully stocked vans containing a large range of parts, fittings, equipment and machines to complete even the toughest of plumbing jobs.

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