A.O. Smith 650A, 740A, BTP(V)-540A Troubleshooting, Water is TOO HOT, Water Heater Makes Sounds

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WATER LEAKAGE IS SUSPECTED
1. Check to see if the water heater drain valve is tightly closed. Also check the cleanout opening for leakage.
2. The apparent leakage may be condensation that forms on cool surfaces of the heater and piping.
3. If the outlet of the relief valve is leaking it may represent:

2.Check the fuses.

•The electrical disconnect switch usually contains fuses.

3.The capacity of the heater may have been exceeded by a large demand for hot water.

4.Colder incoming water temperature will lengthen the time required to heat water to the desired temperature.

•If the heater was installed when incoming water temperature was warm, colder water creates the effect of less hot water.

5.Look for hot water wastage and leaking or open hot water faucets.

6.Sediment or lime scale may be affecting water heater operation. Refer to MAINTENANCE for details.

7.Heater or burner may be dirty.

•Clean all heater flue pipes and flue connector, see

MAINTENANCE.

•Have burner properly cleaned and readjusted.

8.Burner may not be firing at proper rate.

•Check gas pressure

9.Burner fan wheel may be dirty.

•Clean fan wheel with a soft brush.

10.Reset button on high limit control (Figure 1) has operated. Press reset button.

WATER IS TOO HOT

1.Refer to WATER TEMPERATURE CONTROL.

WATER HEATER MAKES SOUNDS

1.Sediment or lime scale accumulation cause rumbling and pounding noises when the heater is operating.

•The sounds are normal, however, the tank bottom should be cleaned. Refer to MAINTENANCE for details.

2.Some of the electrical components of the water heater make sounds which are normal.

•Excessive water pressure

•Excessive water temperature

•Faulty relief valve

Excessive water pressure is the most common cause of relief valve leakage. It is often caused by a “closed system”. If a check valve, back flow preventer, or pressure-reducing valve is in the inlet system it will not permit the expanded hot water volume to equalize pressure with the main. The relief valve must release this water or the water heater or plumbing system will be damaged. Refer to MAINTENANCE – RELIEF VALVES.

When such a condition is encountered, local codes or inspection agency should be consulted to determine which system is acceptable in your area. These may consist of:

•Installation of a second relief valve with lower setting than the primary relief valve.

•An expansion tank of suitable size and pressure rating and provision to avoid water logging.

HOT WATER ODOR

On occasion, hot water may develop a strong odor. If this occurs, drain the heater completely, flush thoroughly, and refill. If the problem persists, chlorinating of the heater and replacement of the factory installed magnesium anodes with aluminum anodes may correct the condition.

Occasionally water softener companies recommend removal of heater anodes for odor reasons.

CAUTION

Unauthorized removal of the anode(s) will void the warranty. For further information contact your dealer.

TROUBLESHOOTING

WARNING

JUMPING OUT COMPONENTS AND/OR CIRCUITS DURING TROUBLESHOOTING CAN CAUSE SERIOUS PROBLEMS WITH THE POWER BURNER’S OPERATING SEQUENCE AND IGNITION SAFETY. IF YOU DO NOT HAVE THE PROPER TEST EQUIPMENT, I.E. A VOLT-OHM METER AND A MICRO-AMMETER DO NOT ATTEMPT TO TROUBLESHOOT OR REPAIR A.O. SMITH EQUIPMENT.

•Contacts click or snap as the heater starts and stops.

•Transformers often hum.

ALTERING THE IGNITION MODULE AND/OR CONTROL BOX WIRING IN ANY WAY COULD RESULT IN INTERNAL DAMAGE TO THE MODULE CIRCUITS, POSSIBLY ALTERING THE IGNITION SEQUENCE ALLOWING GAS VALVES TO OPEN BEFORE THE HOT SURFACE IGNITER IS UP TO IGNITION TEMPERATURE.

NOTE: ANY BYPASS OR ALTERATION OF THE UNITS SAFETIES WILL RESULT IN VOIDING THE APPLIANCE WARRANTY.

Before performing any troubleshooting familiarize yourself with the particular appliance. A. O. Smith power burners are supplied with Honeywell® ignition control systems and Robertshaw® gas control valves, see Figures 10 and 11.

®Honeywell is a registered trademark of Honeywell International Inc. 30

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Contents Installation Operation Maintenance Limited Warranty Models BTPV-540A, 650A and 740AROUGH-IN Dimensions ForewordTable of Contents General Safety InformationFeatures Extended NON-USE PeriodsRequired Ability Installation InstructionsDishwashing Machine Requirement UncratingAIR Requirements Hard WaterClearances VentingHorizontal SIDE-WALL Venting For Btpv Models Barometric Draft Control AssemblyVertical Venting for BTP Models Vent ConnectionsVent System Installation Vent Terminal LOCATIONS-EXHAUSTDirect Venting for Btpv Models Vent Terminal LOCATIONS-INTAKEDirect Vent System Installation Drain Valve and Access Panels GAS PipingGAS Pressure Regulation ANY Supply Pressure Testing Exceeding 1/2 PSIG. GASGAS Meter Size City Gases only GAS ValvesWater Line Connections Relief ValveSystem Connections Installation Diagrams Circulating Pump Wiring DiagramWiring Diagram for Tempered Water Loop if Used Circulating Pump Wiring Diagram Page Manifold Kits Purging Heater WiringStart UP FillingPage Page For Your Safety Read Before Lighting Sequence of Operation Adjustment for High Elevation Application Premix LOW NOx Burner Exploded View for BTP Models Premix LOW NOx Burner Exploded View for Btpv Models Maintenance General InformationDraining Sediment RemovalLime Scale Removal Checklist and Service Water Heater Makes Sounds TroubleshootingWater is TOO HOT HOT Water OdorMotor will not RUN Burner Lockout Once in a WhileNoisy Burner Operation GAS Fails to Shut OFFModel Btpv Limited Warranty Page Page Replacement Parts

BTP(V)-540A, 650A, 740A specifications

A.O. Smith is renowned for its innovative water heating solutions, and the 650A, 740A, and BTP(V)-540A models exemplify this legacy. These water heaters are designed with advanced technology and feature a range of specifications tailored to meet diverse heating needs.

The A.O. Smith 650A model stands out with its efficient design and high-capacity heating capabilities. It is equipped with a powerful heating element that ensures rapid water heating, allowing consumers to enjoy hot water without long waits. The unit's tank is insulated with durable materials, which minimizes heat loss and enhances energy efficiency. Additionally, it incorporates a glass-lined tank that resists corrosion and extends the lifespan of the water heater, making it a reliable choice for households.

Moving on to the 740A model, this unit is designed for larger applications and can accommodate significant hot water demands. Its advanced heating technology includes an impressive recovery rate, which enables it to supply hot water even during peak usage times. The 740A is also equipped with smart diagnostics that monitor the system's performance, ensuring optimal operation and identifying potential issues before they escalate. This feature enhances user convenience and reduces maintenance costs.

The BTP(V)-540A takes efficiency one step further with its unique heat pump technology. It captures ambient heat from the surroundings to heat water, significantly reducing energy consumption compared to traditional electric water heaters. This eco-friendly model is ideal for those looking to lower their energy bills without sacrificing performance. The BTP(V)-540A also features a user-friendly digital display that allows users to easily adjust settings and monitor performance.

In summary, the A.O. Smith 650A, 740A, and BTP(V)-540A models showcase the brand's commitment to quality, efficiency, and innovation. Each model comes with distinct features tailored to different household requirements. With advanced heating technologies, robust construction, and user-friendly interfaces, these water heaters represent some of the best options available in the market for ensuring a reliable hot water supply. A.O. Smith continues to set the bar high in the water heating industry, making these models a smart investment for any home.
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