Rheem Continuous Flow Error Codes – Perth Homeowner’s Guide

If you own a Rheem Continuous Flow Hot Water System in Perth, chances are you appreciate the convenience of instant hot water on demand. Rheem systems are known for their reliability, but like all appliances, they can sometimes run into issues.

When something goes wrong, your Rheem system will usually display an error code. These codes are designed to help you (and your plumber) identify the problem quickly.

But what do they actually mean?

In this guide, we’ll cover the most common Rheem Continuous Flow error codes, what they indicate, and when it’s time to call a professional plumber.

Why Do Rheem Systems Show Error Codes?

Modern continuous flow hot water systems use built-in diagnostics to monitor performance and safety. When a fault is detected, the unit stops or limits operation and displays an error code.

This not only prevents damage to the system but also ensures the safety of your household by shutting down if a dangerous condition is detected.

Common Rheem Continuous Flow Error Codes

Here are the error codes you’re most likely to encounter on a Rheem Continuous Flow system in Perth:

Error Code 03 – EZ Link Fault

Indicates a communication issue between linked units.

Try turning the system off and back on. If it persists, professional service is required.

Error Code 05 – Imperfect Combustion

The unit has detected a combustion problem.

This could be caused by blocked burners, gas pressure issues, or a dirty system. Book a service inspection.

Error Code 10 – Abnormal Low-Rate Combustion

Suggests the gas isn’t burning as efficiently as it should.

This can lead to higher bills and reduced performance. A plumber should investigate.

Error Code 11 – Ignition Failure

The unit tried to ignite but failed.

This can be caused by an interrupted gas supply, low gas, or faulty ignition parts. First check your gas supply, then call a plumber if the issue continues.

Error Code 74 – Communication Fault

The system has lost connection between the heater and the remote controller.

Usually requires professional servicing.

Error Code 75 / 76 / 79 – Fan Motor Failure

Indicates that the fan motor is drawing the wrong current or has failed.

These are not DIY repairs—qualified service is essential.

Error Code 80 / 81 / 82 – Gas Supply or Flame Failure

May mean a gas cut-off, no flame detected, or a circuit board issue.

These are safety-critical faults and need urgent attention.

Error Code 90 / 99 – Fan Motor Ventilation Fault

The fan is not providing the required ventilation.

This can be caused by blockages, dirty components, or electrical faults. Professional repair is needed.

What To Do If Your Rheem Shows an Error Code

Take note of the error code – this will help the plumber diagnose faster.

Check the basics – for ignition issues, check that your gas supply is on and power hasn’t tripped.

Reset the system – sometimes a power cycle can clear minor faults.

Call a licensed Perth plumber – ongoing faults, combustion issues, or anything gas-related must be handled by a professional.

Why Call Ember Plumbing & Gas in Perth?

At Ember Plumbing & Gas, we specialise in Rheem hot water systems, including fault diagnosis, servicing, and replacements. Our plumbers are fully licensed and experienced with continuous flow technology, meaning we can quickly get your system back up and running.

Same-day hot water repairs across Perth
Fixed upfront pricing—no hidden surprises
Fully licensed gas plumbers
Experience with all Rheem models

Preventing Future Rheem Errors

Regular servicing can help prevent many of the issues that trigger error codes. A professional service includes:

• Flushing the system to remove scale
• Cleaning burners and fan components
• Checking gas pressures
• Testing electronics and safety devices

By servicing your hot water system every 1–2 years, you can extend its lifespan and avoid costly breakdowns.

If your Rheem Continuous Flow hot water system in Perth is showing an error code, don’t panic. Many issues can be quickly diagnosed and repaired by a licensed plumber.

The key is to act quickly—ignoring error codes can lead to bigger, more expensive problems.

For expert help with Rheem hot water repairs, servicing, or replacements, call Ember Plumbing & Gas today on 0477 777 301.

We’re Perth’s trusted hot water specialists, keeping homes comfortable and hot water flowing year-round.