Name: Noritz Tankless Water Heater Code 51 [Why + How To Fix ] - FireplaceHubs
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Noritz Tankless Water Heater Code 51 [Why + How To Fix ] - FireplaceHubs

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Skip to contentThe Noritz tankless water heater code 51 indicates gas solenoid valve failure. More often than not, you’d have to replace the gas solenoid valve to solve the issue.But sometimes, the error code can also come up due to a faulty control board. When the board gets damaged, it can show all types of error codes and code 51 is no exception.You’ll learn how to replace the gas manifold solenoid in this guide and clear the error code to get your heater to work normally once again. So, let’s dive in!Note: Read our ultimate guide on Noritz tankless water heater problems &amp; error codes.Gas manifold solenoid failure is the number one reason for flashing the error code 51 on Noritz’s remote display. The main points of concern that cause it to fail are:To troubleshoot the issues properly, first of all, start by inspecting the gas valve or gas supply and ensure the unit is receiving the proper gas and the right voltage.Secondly, if the things appear to be working correctly, verify whether the water dripped into the manifold. If you find any water inside the manifold, you will need to replace it for sure.Even if there aren’t water leaks into the manifold, you’d most likely have to replace it. Check the coil resistance first if you have a multimeter. Here are the resistance readings you should get if you have a normal gas manifold solenoid:If the issue is only with the SVO, the gas valve needs to be replaced. But if the issue is with either SV1, SV2, or SV3, the manifold plate will have to be replaced. You’ll need the following tools to replace it:So, that’s how you can replace the manifold plate. But wait, there’s more. You need to make sure the gas manifold is set at the right pressure so that there are no further issues down the line.And you’ll also have to use the manometer to test the gas pressure. Keep on reading to learn how you can do it.You can test the gas manifold pressure by taking a manifold pressure chart and a digital manometer. Let’s complete the next steps to check the manifold gas pressure.Now, turn on the manometer and wait until it shows 0.00. Then, press the power button on the meter. Set the unit to In-Wg. Here’s a picture to show what it should look like:Place the manometer port at the manifold testing point. Then, turn on the water inlet valve and open the hot water faucets over 3GPM to adjust the manifold.Note: The burner red light should be on if your unit produces enough hot water.To ensure the pressure is well fluctuating, detach the manometer port from the testing point and press the “zero” button in the meter. You can see the meter will show 000 resistance.After that, reattach the digital meter’s port to the point, it will display continuous resistance which indicates the pressure is fluctuating well.You can easily adjust the manifold gas pressure by holding down the adjusting buttons. Here, you will see the Up, Down, Min, and Max Buttons.Once completed, place the front cover panel on the top of the unit and reattach the 4 screws tight enough. Finally, head to the water inlet and gas valve to the On position.Hope you won’t see the error code and will get enough hot water.We highly recommend you replace the manifold plate or the control board if necessary.&nbsp;If you face any problems, watch the below video on how to replace and adjust the manifold gas pressure.As you’d know, a faulty circuit board can throw error codes even when everything is fine with your water heater. So if error code 51 remains even after replacing the gas solenoid valve, there’s a strong possibility that you have a bad circuit board.If you have a faulty circuit board, you can’t repair it. Your only option is to replace it. It’s an expensive component and it’ll cost a fortune but you have no other choice and you have to replace it to get your heater to work again.A gas solenoid manifold is a device that controls the flow of gas. The amount of gas that the gas valve delivers to the burner is called manifold gas pressure.Basically, Noritz tankless gas-fired unit pressure depends on model and installation requirements. It usually requires a minimum pressure of 5″ WC for natural gas pressure and 8″ WC for propane gas pressure.The Red LED light won’t stay lit if your unit if the burner in your heater keeps going out or there are error codes. You’ll have to fix the underlying issue so that it can stay lit.Now, you know what the Noritz tankless water heater code 51 means, why it comes up, and what you can do to fix it. Most of the time, the gas manifold plate will be at fault and you’ll end up replacing it.You can do it yourself. But if you don’t comfortable, you can always seek help from a qualified technician. However, the circuit board can also be faulty at times and you may have to replace it. Comment below if you have any questions about this error code.Fireplacehubs.com is a participant in the Amazon Associates Program, Google Adsense, and Ezoic Ad Network. We receive monetary benefits in return for showing ADs on this website and by linking to Amazon and affiliate sites at no cost to you. Learn more

Skip to contentThe Noritz tankless water heater code 51 indicates gas solenoid valve failure. More often than not, you’d have to replace the gas solenoid valve to solve the issue.But sometimes, the error code can also come up due to a faulty control board. When the board gets damaged, it can show all types of error codes and code 51 is no exception.You’ll learn how to replace the gas manifold solenoid in this guide and clear the error code to get your heater to work normally once again. So, let’s dive in!Note: Read our ultimate guide on Noritz tankless water heater problems &amp; error...

Noritz Tankless Water Heater Code 51 [Why + How To Fix ] - FireplaceHubs

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