Noritz N-0751M Owner's Manual
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Noritz N-0751M Owner's Manual

Tankless gas water heater
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TANKLESS GAS WATER HEATER
Owner's Guide
WARNING
- Do not store or use gasoline or other flammable vapors and liquids in the
vicinity of this or any other appliance.
- WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor's phone. Follow the
gas supplier's instructions.
• If you cannot reach your gas supplier, call the fire department.
- Installation and service must be performed by a qualified installer, service
agency or the gas supplier.
CERTIFIED
R
Low NOx
Approved by
SCAQMD
SAR8558
Rev. 08/06
Model N-0751M
If the information in this manual is not followed exactly, a fire or explosion
may result causing property damage, personal injury, or death.
Thank you for purchasing this Noritz Tankless Gas Water Heater.
Before using, please:
Read this manual completely for operation instructions.
Completely fill out the warranty registration card (included separately) and
mail the detachable portion to Noritz America Corporation.
Keep this manual (and the remainder of the warranty registration card) where it
can be found whenever necessary.
Installation must conform with local codes, or in the absence of local codes,
the National Fuel Gas Code, ANSI Z223.1/NFPA 54.
Noritz America reserves the right to discontinue, or change at any time, the
designs and/or specifications of its products without notice.
NORITZ America Corporation
*SAR8558 T*

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Questions and answers

Jamie
April 22, 2025

My tankless water heater is giving a code 11. The gas pressure is good but the ignition light won’t turn on

0
1 comments:
Mr. Anderson
May 11, 2025

Error code 11 on the Noritz N-0751M tankless water heater indicates an ignition failure. This means the unit detects a demand for hot water but cannot ignite the burner.

Possible causes include:
- No spark
- Insufficient gas supply
- Ignition detected but not sensed by the flame rod

To resolve the issue:
1. Use the sight glass on the burner to check if ignition is occurring.
2. Confirm the presence of three elements needed for combustion: gas, spark, and air (air is usually not an issue in tankless units).
3. If no ignition, check for:
- Proper gas supply and pressure
- Functioning igniter
- Clean and properly connected flame rod

Ensure all components are functioning and connected correctly. If the issue persists, contact a qualified service professional.

This answer is automatically generated

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Summary of Contents for Noritz N-0751M

  • Page 1 Installation must conform with local codes, or in the absence of local codes, SCAQMD the National Fuel Gas Code, ANSI Z223.1/NFPA 54. Noritz America reserves the right to discontinue, or change at any time, the designs and/or specifications of its products without notice. NORITZ America Corporation SAR8558 Rev.

  • Page 2: Important Safety Information

    Important Safety Information-1 To prevent damage to property and injury to the user, the icons shown below will be used to warn of varying levels of danger. Every indication is critical to the safe operation of the water heater and must be understood and observed. Potential dangers from accidents during installation and use are divided into the following three categories.
  • Page 3 3. Turn off gas and water supply • Do not try to light any valve. appliance. 4. Call the nearest Noritz agent • Do not touch any electrical switch; do not use any phone in your building. Explosion Hazard ;...
  • Page 4 Be sure (trees, timber, boxes with flammable to do. Be sure to do. materials etc.). For Natural Gas [When installing outdoors] Upper: Min. 36" N-0751M Natural Gaz Naturel 199,900 BTU Left side: 12,000 BTU Right side: Min. 6" 10.5" 0.65 2.55"...
  • Page 5 Shock. or other reproductive harm. This product may contain such substances, be their Consult the nearest Noritz agent if origin from fuel combustion (gas, oil) or the water heater location needs to components of the product itself. be changed.
  • Page 6 4500 ft. above sea level. unit for an extended period of time. Do not drink the first use of hot water from the For installations at higher elevations, contact Noritz unit in the morning. America for Instructions. Clean the filter on the water inlet as Do not disassemble the remote controller.

  • Page 7: Table Of Contents

    Contents Important Safety Information ............... 2 Contents ......................7 General Parts Main Unit ....................8 Remote Controller ..................9 Initial Operation ................... 10 How to Use Muting the Remote Controller ..............11 Setting and Using the Water Heater ............12 Flow Meter Alarm ..................

  • Page 8: General Parts

    General Parts Main Unit Indoor/Outdoor Wall Mounted, Power Vented Model Flue Collar Front Cover Air Inlet Water Drain Valve (with Water Filter) (Inside Water Inlet) p.20) Pressure Relief Valve Water Supply Valve Gas Supply Valve * The above illustration shows an example of installation. The exact installation configuration may be slightly different.

  • Page 9: Remote Controller

    Remote Controller (RC-7649M) What is actually displayed depends on how the water heater is set. Burner On Indicator Setting Buttons When burning, the For setting the hot indicator is lit. water temperature, p.13 and 15) the flow meter alarm, and other settings. Priority Indicator When this indicator is lit, the hot water temperature...

  • Page 10: Initial Operation

    Initial Operation Before the first use of your water heater, make the following preparations. 1 through 4 Follow steps Open the water supply valve. OPEN CLOSED Open a hot water fixture to confirm that water is available, and then close the fixture again.

  • Page 11: How To Use

    How to Use Muting the Remote Controller The remote controller will emit a sound when any button is pushed. This sound can be muted if it is desired. * Initial factory setting is with sound Hold the Power On/Off Button for five seconds. Muted Sound No sound...

  • Page 12: Setting And Using The Water Heater

    How to Use Setting and Using the Water Heater (Starting with the Power Off) Press the Power On/Off Button. The temperature will be displayed on the remote control thermostat. Previous set temperature (Ex.: 110°F) DANGER To prevent scalding: High Temperature Hot Water Heater temperatures over 125°...
  • Page 13 The temperature settings below are examples. The temperature setting °F : necessary depends on the usage, the length of piping and the time of year. The maximum output temperature Contact the installer or Noritz America can be set using the remote when setting the maximum output tem- controller.

  • Page 14: Flow Meter Alarm

    How to Use Flow Meter Alarm (Starting with the power off) Set temperature. Press the Power Preparation Always check On/Off Button temperature setting before use. 1. Plug the bath drain. Cold The temperature will be displayed on the remote control thermostat. Check the indicator lights.
  • Page 15 Water Temperature An alarm will sound for ten seconds when the flow The temperatures settings below are only examples. The °F : temperature setting necessary will depend on the usage, reaches the set level. the length of piping and the time of year. Warm Warmer The water will continue to run unless it is...

  • Page 16: Adjusting The Maximum Output Temperature

    How to Use Adjusting the Maximum Output Temperature Change the Turn off the Press and hold the flow temperature using power. meter alarm set button until the setting buttons. a sound is heard (2 sec.). Tone sounds after 2 sec. Down The upper limit of the hot- water supply temperature can...

  • Page 17: Preventing Damage From Freezing

    * The freeze prevention heaters will not prevent the plumbing external to the unit from freezing. Protect this plumbing with insulation, heat tape or electric heaters, solenoids, or pipe covers. If there remains a freezing risk, contact the nearest Noritz agent. Take the measures below for extremely cold temperatures*.

  • Page 18: Turning The Unit Back On

    Preventing Damage from Freezing-2 If the water heater will not be used for a long period of time, Drain the water. Drain the water as follows: CAUTION To avoid burns, wait until the equipment cools down before draining the water. The appliance will remain hot after it is turned off.

  • Page 19: Regular Maintenance

    Regular Maintenance-1 Periodic Inspection CAUTION To prevent burns or scalding, turn off the power button and wait until the equipment cools before performing maintenance. Be sure to do. For dust and soot in For laundry, newspaper, timber, Check Check the exhaust vent or oil, spray cans and other exhaust vent terminal.

  • Page 20: Periodic Maintenance

    Periodic Maintenance Water Drain Valve (with Water Filter) If the water drain valve (with water filter) is covered with debris, the hot water may not run smoothly, or the unit may put out cold water. Check and clean the filter as explained below. * To avoid burns, wait until the equipment cools down before draining the water.

  • Page 21: Troubleshooting

    Troubleshooting-1 Initial Operation • Check for reversed plumbing or crossed pipes. Unit does not attempt to ignite • Check the water drain valve filter. ( p.20 ) when water is running. Unit attempts to ignite but fails • Reset unit and try again. There may be air in the gas line. •...

  • Page 22: Amount Of Hot Water

    Troubleshooting-2 (Continued) The water is not hot enough. • Are the gas and water supply valves fully open? • Is the water temperature setting appropriate? p.12 and p.13) • If the amount of hot water required is very high, it is possible for the temperature to be lower than the temp- erature set on the remote controller.
  • Page 23 Remote Controller • Has there been a power failure? The light on the power button does not come on. • Is the power connected properly? The water temperature changes • The temperature setting and the flow meter alarm setting after a power failure or when the may both need to be reset after a power outage.

  • Page 24: Error Code Cause Action

    Abnormal combustion, Have a professional check the gas supply pressure. low gas supply pressure Contact the nearest Noritz agent. Abnormal combustion Contact the nearest Noritz agent. Contact Noritz America if: • Any other error code appears.

  • Page 25: Follow-Up Service

    For repairs after the warranty period, there will be a charge on any service, and service will only be performed if the unit is deemed repairable. Period of Time for Stocking Repair Parts Noritz will stock repair and maintenance parts for this unit within ten (10) years of the date of original installation. Reinstallation If you want to reinstall the appliance at a different location, confirm that the gas and power supply indicated on the rating plate are available at the new location.

  • Page 26: Specifications

    • Specifications may be changed without prior notice. Specifications • The capacity may differ slightly, depending on the water pressure, water supply, piping conditions, and water temperature. Specifications Item Specification Model Name N-0751M Type Installation Indoor/ Outdoor, Wall Hanging Air Supply/Exhaust Power Vented Ignition Direct Ignition...

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