What does LC mean on a Rinnai water heater? The LC code is signaling your tankless has too much scale so it needs to be flushed. You can hire a company to perform the service which will cost roughly $100-$150, or you can do the flush yourself but you will need a few things.
What should I do if my Rinnai Water Heater says LC?
If the “LC” error code appears on display you have to clean the deposits by flushing the heat exchanger. Otherwise, replace the heat exchanger. “LC” is the only code from all Rinnai error codes that will allow the water heater to keep running. Note: some of the error codes and problems can only be resolved by a licensed technician.
What are the Rinnai error codes for the heat exchanger?
No code: Nothing happens when water flow is activated. Rinnai error code 00 (or LC0, LC1, LC2, LC3, LC4, LC5, LC6, LC7, LC8, and LC9) indicates there has been scale build-up in the heat exchanger. To fix this error code, you need to flush the heat exchanger. If this does not work, you may need to replace the heat exchanger.
What happens when water flow is activated on Rinnai heat exchanger?
No code: Nothing happens when water flow is activated. Rinnai error code 00 (or LC0, LC1, LC2, LC3, LC4, LC5, LC6, LC7, LC8, and LC9) indicates there has been scale build-up in the heat exchanger. To fix this error code, you need to flush the heat exchanger.
What does priority mean on Rinnai tankless water heater?
The green Priority light will glow indicating that this controller is controlling the temperature and that the Rinnai Tankless Water Heater is ready to supply hot water. IMPORTAnT: The priority can only be changed while no hot water is running. Just so, how do I fix error code 11 on Rinnai?
See more
How do I get a Rinnai error code?
To display error codes, press the ON/OFF button followed by the thermostat button to cycle through the error codes. 2. To display the water flow through the water heater, press the thermostat button (hold for 2 seconds) and then press the ON/OFF button while continuing to hold the thermostat button.
What does loc mean on a Rinnai tankless water heater?
A beep will sound confirming that the controller is locked. The display will alternately show “LOC”, the temperature setting, and a diagnostic code if one has been activated. All of the controllers in the system are also locked.
How do I reset my gas tankless water heater?
0:010:41How To Reset Your Tankless Water Heater - YouTubeYouTubeStart of suggested clipEnd of suggested clipThen you can shut it off from the breaker. Wait 30 seconds. And then resupply the power. If you doMoreThen you can shut it off from the breaker. Wait 30 seconds. And then resupply the power. If you do notice any type of leaking coming from the inside of your tankless.
Does the Rinnai have a reset button?
Press On/Off button twice. Turn hot water back on and test. You may have to try this a couple times to reset the system. There are several things you can do before calling a plumber.
How do I reset my Rinnai LC code?
After flushing water heater, the procedure to reset LC codes: Push the two switches (A and B) on PC Board at the same time for five seconds. Water heater will return to normal operation and LC# count returns to 0. This hard reset procedure is not in owners/installation manual or tech sheet.
How do I reset my Rinnai tankless heater?
Press and hold the Connect button on the module until the LED blinks RED and WHITE, and then release then QUICKLY tap 3 times. This will restore the module back to original factory settings.
Do tankless water heaters have a reset button?
To prevent accidental resets, tankless water heaters are designed to prevent accidental resets, so you are probably going to have to hold the button down to get the reset to trigger.
What causes a tankless water heater to stop working?
The Air Supply or Exhaust Is Blocked At times, your exhaust or air supply might get blocked, which can cause your tankless water heater to stop heating. Many water heaters will automatically shut off as a way to protect the appliance and help prevent other safety hazards that could result.
Why am I not getting hot water from my tankless water heater?
If you get no hot water when only one hot water appliance is running and you have a gas tankless unit, make sure that: You've paid your gas bill (your tankless water heater can't heat water without a steady gas supply!) Your water heater vent is unobstructed (be careful—these are usually located on the roof)
How do you reignite a Rinnai tankless water heater?
1:382:30How to start up your Rinnai Water Heater by Homes by ... - YouTubeYouTubeStart of suggested clipEnd of suggested clipOkay step four open the cold water supply cold water supply is right here going to turn it parallelMoreOkay step four open the cold water supply cold water supply is right here going to turn it parallel to the pipe. Step six turn on the power. Okay. Again gonna go back to the switch.
Why is my Rinnai beeping?
A Rinnai tankless water heater's alarm can beep continuously when it encounters errors. Some of these potential faults include error codes 2 through 79. Certain events may also cause the unit's display to show error codes accompanied by other letters instead of numbers.
How do I reset my Rinnai water heater?
Turn off all hot water faucets/taps. Press On/Off button twice. Turn hot water back on and test. You may have to try this a couple times to reset the system.
Why is my Rinnai water heater not working?
Start by troubleshooting to see if any of the reasons listed below is the culprit and remedy the issue as needed.
Rinnai water heater error codes, meanings and fixes
The Rinnai water heater uses a self-diagnostic tool to monitor its operation regularly. When a problem is detected, the error code flashes at the temperature display on the following models: MC-91, MCC-91, and MC-502. While it flashes at the clock display on models MC-100 and BC-100. With most of the error codes, the unit will turn itself OFF.
Why am I not getting hot water from my Rinnai tankless water heater?
If you water heater has power and it is still not providing how water, this could be as a result of a number of reasons;
Rinnai tankless water heater control panel not working
Start by checking whether the unit is receiving power from the outlet. then ensure that the power circuit has incoming power of 120 VAC. Lastly, check for continuity with a multimeter and replace any blown fuses.
Rinnai tankless water heater beeping
When your water heater beeps, it also displays an error code to alert you to a problem with the system. potential causes of the beep include;
What is the priority button on Rinnai?
The priority button is located on the temperature controller. It has a green LED that glows, to indicate that the thermostat is regulating the water temperature and the unit is ready to supply hot water. It also locks or unlocks the controller.
What is the error code for a Rinnai water heater?
An audible “ beeping ” alarm generally accompanies tankless water heater error codes. If you have no hot water, you may have exceeded your tankless water heater capacity or likely have at least one error code.
What is the code for a Rinnai controller?
Rinnai error code 16 represents an overheating warning. If there is an error code, 16 displayed on the controller, inspect your Rinnai for low water flow or any foreign objects, debris, restrictions, or blockage in the airflow, vent, combustion chamber, heat exchanger, and exhaust system.
What is the code for a rinnai solenoid valve?
Rinnai error code 52 indicates a problem with the modulating gas solenoid valve and its readings. To fix Rinnai error code 52 , ensure the terminals on the wiring harness are not damaged or loose. In addition to that, you may need to measure the resistance and voltage of the valve.
What is the code for a Rinnai tank?
Rinnai error code 35 is associated with a problem with the tank’s temperature sensor. If your Rinnai is showing an error code 35, look for any damaged or loose sensor connections. Clean any build-ups and dirt on the sensor, and check its resistance readings. If the error persists, replace the sensor.
What is the Rinnai error code 00?
Rinnai error code 00 (or LC0, LC1, LC2, LC3, LC4, LC5, LC6, LC7, LC8, and LC9) indicates there has been scale build-up in the heat exchanger. To fix this error code, you need to flush the heat exchanger. If this does not work, you may need to replace the heat exchanger.
What is the code 11 on a Rinnai?
Rinnai error code 11 is indicative of a problem with the ignition of the unit. Problems with the gas and electrical system can cause a Rinnai error code 11, so they should be inspected for problems. The Rinnai error code 11 may need to be assessed and fixed by a trained technician.
What does error code 02 mean on a Rinnai?
Rinnai error code 02 indicates that the burner will not operate while the freeze protection mode is active. The Rinnai error code 02 cannot be fixed by the user, and the only solution is to make a service call and have a certified technician inspect your Rinnai.
Rinnai Tankless Water Heater Error Codes
What it Means: Water heater will not work during freeze protection mode.
By Anthony Barnes
Anthony Barnes is the founder of Water Heater Hub and a second-generation plumber by profession. Before developing Water Heater Hub, Anthony Barnes was a full-time plumber, and he has undertaken a wide variety of projects over the decades.
