A.O. Smith 200M, 225M, HW-120M, 160M warranty No Spark AT Pilot Burner, Yes

Page 25

CHART 2

S8600 (NATURAL GAS AND LP GAS)

INTERMITTENT PILOT SYSTEM TROUBLESHOOTING

NO SPARK AT PILOT BURNER

Replace ignition module.

NO

 

NO

Turn on gas supply. turn on power supply.

 

 

 

NO

 

Securely connect cable

 

 

 

 

and/or ground wire.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NO

 

 

Carefully bend downward

 

 

 

 

top of ground strap

 

 

 

 

 

 

 

 

 

to achieve 1/8”

 

 

 

 

 

 

spark gap.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NO

 

 

Replace ignition

 

 

 

 

 

 

 

 

 

 

module.

 

 

 

 

 

 

 

 

 

 

 

 

Turn gas supply off.

Is voltage (24 Vac) across the 24 V terminals on “Call for heat”?

YES

Is voltage (24 Vac) across the PV & MV/PV terminals on

“call for heat”?

NOTE: (FOR LP MODELS ONLY) Pilot valve will be de-energized if module goes into lockout condition. Reset system by turning electrical power off or by turning system controller to “OFF” or down below “Call for heat”. Wait one minute then turn system on.

YES

Turn off power supply.

Is ignition cable firmly plugged into module?

Is green ground wire firmly attached to mounting screw

and GND terminal on module?

YES

Ensure ground strap is the closest metal to the igniter/sensor

rod (electrode) to prevent the spark from shorting out to other metal parts (pilot screen, pilot shield, etc.).

Ignition cable must not touch metal surfaces or

current carrying wires.

Is there a 1/8” gap between ground strap and electrode?

YES

Are the ceramic insulators surrounding the electrode

cracked or broken?

YES

Replace pilot burner assembly or bus bar.

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Contents Commercial GAS Copper Heat Exchanger Water Heater Models HW-120M, 160M, 200M, 225MHeater Performance Data ROUGH-IN-DIMENSIONSGeneral Safety Information Table of ContentsForeword Grounding Instructions High Altitude InstallationsChemical Vapor Corrosion Liquid Petroleum ModelsAutomatic GAS Shutoff Control FeaturesThermal Balancer Intermittent Ignition Control ModuleSafety Flow Switch Tank Temperature ControlCirculating Pump Intermittent Ignition Control Module I.I.DDrain Valve Not Supplied Safety Flow Switch SettingsInstallation Instructions Venting Proper Vent Pipe InstallationRelief Valve Confined SpaceClosed Water System Hard WaterWater Line Connections Water Potable HeatingPiping Diagrams Page Page Correct GAS GAS ConnectionsSizing GAS Supply Line GAS Supply Pipe Sizes in InchesElectrical Information Page General OperationFilling Purging of GAS LineOperating Instructions for I.I.D. Models For Your Safety Read Before OperatingOver 170F 77C Checking and Adjusting the InputPilot and Main Burner Maintenance Service InformationD. Pilot Burner Main Burner for HW HeatersProtector Switch Continuity Test Protector SwitchThermal Balancer Schematic Diagram Inspecting the Heat Exchanger Venting SystemElectrical Service Preventive MaintenanceReplacement Parts GAS Pressure RegulatorRemoving Light Deposits Deliming SolventsHeavy Lime Deposits Deliming the HW Water HeaterRemoving Silicate CheckoutSystem Operation YES No Spark AT Pilot BurnerReplace pilot burner Replace ignition Module Spark AT Pilot Burner but Pilot will not LightMV & MV/PV? Pilot Burner Lights but Main Burner does not LightClaim Procedure Service and Repair ExpensesConditions and Exceptions Limitations on Implied Warranties

HW-120M, 225M, 200M, 160M specifications

A.O. Smith is renowned for its range of advanced water heaters, and the 160M, 200M, 225M, and HW-120M models stand out as some of the most reliable and innovative options available. These water heaters are designed to deliver exceptional performance, energy efficiency, and user-friendly features, making them ideal for various residential and commercial applications.

The A.O. Smith 160M model boasts a robust design that ensures longevity and efficiency. It has a 160-gallon capacity, providing ample hot water for households with high demand. This model incorporates insulation technology that minimizes heat loss, contributing to energy savings and reduced utility bills. Additionally, it features a durable exterior that is resistant to rust and corrosion.

The 200M model takes performance a step further with a higher capacity of 200 gallons, making it suitable for larger homes or businesses. This model is equipped with advanced components, including a high-efficiency burner and a powerful thermocouple that ensures reliable heating. The 200M also includes user-friendly controls that allow for precise temperature settings and easy operation.

Next in line is the A.O. Smith 225M, which offers an impressive 225-gallon capacity. This model is designed for heavy-duty usage and features a reinforced tank to withstand high pressure. The 225M is also equipped with state-of-the-art flame retention technology that optimizes fuel use, enhancing the overall efficiency of the unit. This ensures that customers not only get hot water when needed but also experience considerable savings on energy costs.

Finally, the HW-120M model is a compact solution that does not compromise on performance. With a capacity of 120 gallons, it is ideal for smaller households or spaces where water heating needs are moderate. The HW-120M includes features such as an LED display for easy temperature monitoring and an integrated safety system that prevents overheating.

All these models utilize advanced technologies such as electronic ignition and enhanced insulation materials, contributing to a reduction in energy consumption and maintenance needs. The combination of these features makes A.O. Smith appliances a smart choice for consumers looking for efficiency, reliability, and performance. With a strong commitment to craftsmanship and innovation, A.O. Smith continues to set the standard in water heater technology, ensuring customers enjoy reliable hot water access while promoting energy efficiency.
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