Rinnai is a massive name in the world of water heaters, and for good reason, they are reliable workhorses. But even top-tier tech runs into glitches now and then. If your water has gone cold, you need to know how to reset your Rinnai tankless water heater quickly to get your home running smoothly again.
In this guide, we will walk you through finding the reset button, the difference between a soft and hard reset, and how to troubleshoot the root cause of the lockout.
Key Takeaways
- Locate the Button: Find the “Connect” or “Control-R” button on the front panel or the on/off button on the controller.
- Try a Power Cycle First: Unplugging the unit for 30 seconds is often safer and faster than a factory reset.
- The Reset Process: Press and hold the Connect button until the LED blinks, or use the controller sequence to clear error codes.
- Safety Check: Always inspect for leaks or gas smells before attempting to restart the unit after a shutdown.
Where Is the Reset Button on a Rinnai Tankless Water Heater?
Unlike traditional tank heaters that have a physical red button on the thermostat, Rinnai tankless units are digital. “Resetting” usually refers to one of two things: clearing an error code on the interface or resetting the Wi-Fi module.
Look for the “Connect” button located on the front of your water heater, typically on the Control-R Wi-Fi module. It is usually situated next to the digital display and control panel. If you don’t have Wi-Fi, your “reset” is done via the main power button on the temperature controller.
Take Note
Performing a factory reset on the Control-R module will wipe your custom settings and wireless network history.
How to Reset a Rinnai Tankless Water Heater
Resetting your unit isn’t complicated, but you need to follow the right steps to avoid damaging the electronics. Here is the standard procedure for resetting the system and the Wi-Fi module.
- Power Cycle the Unit: Before messing with buttons, simply turn off the power to the unit. Unplug it from the wall or flip the circuit breaker. Wait 30 seconds, then power it back on. This clears most minor glitches.
- Clear Error Codes: If you see a code on the controller (like Code 11 or 12), turn off the hot water taps. Press the “On/Off” button on the controller 5 times quickly. This acts as a soft reset for the computer.
- Locate the Connect Button: If you need to reset the Wi-Fi or Control-R module, find the button labeled “Connect” or “Control-R” on the front panel.
- Initiate the Reset: Press and hold the Connect button. Watch the LED lights; they should blink from red to white.
- Confirm the Sequence: Some specific models require you to press the button, release it, and then press it three times in quick succession. Listen for three beeps to confirm the reset was successful.
- Test the Water: Open a hot water faucet. The unit should fire up and begin heating.
- Inspect for Leaks: While the unit is running, feel around the base and checking the piping for any drips. If everything is dry and hot, you are good to go.
When to Reset a Rinnai Water Heater
You shouldn’t have to reset your Rinnai water heater often. If you find yourself doing it weekly, there is an underlying issue. However, here are the main scenarios where a reset is necessary.
Wireless Network Change
If you get a new router or change your internet service provider, your water heater loses its connection to the app. You need to perform a reset on the Control-R module to wipe the old Wi-Fi credentials so you can pair it with your new network.
Error Codes
When the internal computer detects a problem, it throws an error code on the digital display. Common codes indicate ignition failure, sensor issues, or venting blockages. Once you have fixed the physical problem (like opening a gas valve), you need to reset the unit to clear the code from the memory.
System Lockout
Sometimes the system performs a “hard lockout” for safety. This often happens after a power outage or a voltage spike. A hard reset helps clear the heater’s memory, acting like a reboot for a frozen computer.
Factory Reset Vs. Power Cycle
There are two ways to get your water heater back on track: a power cycle or a factory reset. It is vital to know the difference so you don’t create more work for yourself.
Factory Settings (Hard Reset)
A factory reset wipes the slate clean. It deletes your Wi-Fi history, schedule preferences, and custom settings, returning the unit to the state it was in when you first unboxed it.
Use this when: You are selling the house, changing Wi-Fi networks, or troubleshooting a persistent software glitch that won’t go away.
Power Cycle (Soft Reset)
This is the “turn it off and on again” method. It interrupts the electricity briefly to force the sensors to re-check the system. The huge advantage here is that you keep all your saved data and settings.
Use this when: You have a minor error code, the screen is frozen, or the water isn’t heating but no code is displaying.
Take Note
Always attempt a power cycle before using the factory reset button. A hard reset should be your last resort after you have ruled out gas supply issues or blocked vents.
Why Does My Rinnai Unit Shut Down?
If your unit keeps locking out, the reset button is just a temporary fix. You need to find out why it is tripping in the first place.
Power Outage or Surge
A sudden loss of electricity can confuse the motherboard. When power is restored, the unit might remain in standby mode or display an error until it is manually reset. Installing a surge protector can help prevent damage to the delicate circuit boards.
Overheating (High Limit Switch)
If the water temperature exceeds the safety limit, the unit will shut down to prevent scalding or damage to the heat exchanger. This often points to a restricted water flow or a scale buildup inside the pipes.
Ignition Failure
If the unit tries to light the burner but fails, it will lock out. This is common if you have run out of propane, the gas valve is partially closed, or the igniter rods are dirty.
Exhaust Blockage
Tankless units need to breathe. If a bird builds a nest in your exhaust vent, or if snow blocks the intake, the sensors will shut the unit down immediately to prevent carbon monoxide buildup.
FAQs
Why is My Rinnai Tankless Water Heater Not Working?
The most common reasons for a total shutdown are a lack of gas supply, a tripped circuit breaker, or a blocked exhaust vent. Check your digital controller for an error code (like Code 11 or 12), which will tell you exactly where to look.
Why Am I Not Getting Hot Water From My Rinnai Tankless Water Heater?
If the unit is running but the water is cold, you might have a crossed plumbing line, a dirty inlet water filter, or a flow rate that is too low to trigger the burner. The ignition system may have failed, or you could have scale buildup affecting the heat exchanger.
Does a Rinnai Tankless Water Heater Have a Fuse?
Yes, Rinnai units have internal glass fuses to protect the electrical components. If the unit is plugged in but the display is completely blank and unresponsive, you may have blown a fuse on the circuit board (PC board).
Final Thoughts
Resetting your Rinnai tankless water heater is usually a quick fix, but it shouldn’t be a daily habit. If you have to press that button constantly, your unit is trying to tell you something is wrong, whether it is airflow, gas pressure, or scale buildup.
Start with a simple power cycle to save your settings. If that doesn’t work, move on to the hard reset. If the problem persists, it is time to call a pro before you accidentally void your warranty.
