A.O. Smith BTH 300A, BTH 400A warranty ECO Switch OPEN. See Figure

Page 20

Display Flashes “05” when button is pressed:

 

 

 

 

 

 

 

Possible Cause

Remedy

 

 

 

 

 

 

 

1.

Temperature Probe wiring

1. Repair Wiring

 

 

 

open

 

 

 

2.

Defective probe

2. Replace probe

 

 

 

 

 

 

 

 

 

 

 

Display Flashes “15” when button is pressed:

 

 

 

 

 

 

Possible Cause

Remedy

 

 

1.

No water in tank and tank

1. The symptom does not

 

 

 

in freezing conditions

reflect a control problem

 

 

2.

Water in tank above freezing

2. Temperature probe out of

 

 

 

 

tolerance, replace temp.

 

 

 

 

probe

 

 

 

 

 

 

 

 

 

 

 

Display Flashes “25” when button is pressed:

 

 

 

 

 

 

 

 

Possible Cause

 

Remedy

 

 

 

 

 

 

 

 

1.

Water in tank is low, probe

1.

Fill tank

 

 

 

immersed in steam

 

 

 

 

2.

Probe wiring shorted

2.

Repair wiring

 

 

3.

Defective probe

3.

Replace probe

 

 

 

 

 

 

 

 

 

 

 

 

 

ECO SWITCH OPEN. See Figure 21.

ECO LED Flashing:

ECO SWITCH OPEN, ECO LED Flashing

FIGURE 21.

 

 

 

 

 

Possible Cause

Remedy

 

 

 

 

 

 

1. This indicates the control has

1. Press button on the

 

 

failed on of its internal

display board to reset

 

 

diagnostic self-tests.

control. If this error

 

 

 

occurs repeatedly,

 

 

 

replace control.

 

 

 

 

 

 

 

 

 

CONTROL BAD. See Figure 22.

 

 

All LEDs Flashing:

 

 

CONTROL BAD, All LEDs Flashing

FIGURE 22.

 

Possible Cause

 

Remedy

 

 

 

 

 

 

1.

Temp. Probe unplugged

1.

Check connectors

2.

Temp. probe wiring damaged

2.

Repair wiring

3.

Water in tank too hot

3. Normal condition when

water t e m p e r a t u r e exceeds safety limit. Allow water to cool or admit water into tank and manually reset the control. Determine cause for overtemp condition.

COMBUSTION AIR BLOCKAGE. See Figure 23.

Pressure Switch LED Flashing:

COMBUSTION AIR BLOCKAGE, Pressure Switch LED Flashing

FIGURE 23.

Possible Cause

 

Remedy

 

 

 

 

 

1.

Combustion air blocked

1.

Check exhaust piping and

 

 

 

flue for obstructions

2.

Blower not operating:

2.

a. Repair wiring

 

a. Check blower wiring

 

b. Replace blower motor

 

b. Check blower motor

 

 

3.

Defective air switch

3.

Replace air switch

4.

Pressure switch jumped out

4.

This controller must sense

 

 

 

an open contact on the

 

 

 

blower proving airflow

 

 

 

switch before the blower

comes on. Check to see if blower proving airflow switch is still connected to the unit.

20

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Contents Cyclone XHE Model BTH 300A and 400A GAS Valve Piping ROUGH-IN-DIMENSIONSForeword Table of Contents FeaturesQuick Installation Tips Horizontal Sidewall Venting Vertical Rooftop VentingDishwashing Machine Requirement Water Temperature Setpoint Adjustment ProcedureHigh Limit Switch E.C.O Installation Instructions Circulating PumpRequired Ability Insulation BlanketsClearances Hard WaterUnconfined Space Confined SpaceUS Direct Vent Canadian Direct VentUS Horizontal Vent Canadian Horizontal VentDirect Venting Direct Vent Terminal InstallationVent Pipe Termination Installation Sequence Vertical Vent Terminal InstallationInstallation of Vent System Vent Length TableControls and Switches Blower Prover SwitchBlocked Outlet Prover Switch Blocked Inlet Prover SwitchConnection of GAS Pipe HOT Surface IgniterGAS Piping System Connections Heater Wiring Page Self Diagnostic Controller OperationSequence of Operation GAS Valve LED FlashingError Codes Fault ConditionsECO Switch OPEN. See Figure Prior to Start UP Required Ability Adjustment Procedure Initial START-UPOperating Instructions Operating Instructions What to do if YOU Smell GASGeneral Information Maintenance Schedule FlushingDraining Sediment RemovalPowered Anode System Powered Anode OperationPower Supply LED Meanings Drain Valve and Access PanelsInstallation Diagrams Install in Accordance with Local Codes Must be Identical Heaters Install in Accordance with Local Codes Page Manifold Kits Burner Operational Problems Not Enough or no HOT WaterWater is TOO HOT Water Heater Makes SoundsMotor will not RUN Motor RUNS, Burner Lights Momentarily Then Locks OUTGAS Fails to Shut OFF Replacement PartsNoisy Burner Operation Model BTH Limited Warranty

BTH 300A, BTH 400A specifications

A.O. Smith has established itself as a leader in the water heating industry, offering a range of products that combine efficiency, reliability, and innovative technology. Among these products, the BTH 300A and BTH 400A models stand out for their advanced features and robust performance, catering to both residential and commercial needs.

The BTH 300A and BTH 400A are high-efficiency water heaters designed with cutting-edge condensing technology, allowing for significant energy savings compared to traditional water heating systems. These models utilize a modulating gas valve that adjusts the burner operation based on the demand for hot water. This smart system not only enhances efficiency but also ensures a consistent supply of hot water without the worry of fluctuations.

One of the standout features of the BTH series is its compact design. Both the BTH 300A and BTH 400A are engineered to fit into smaller spaces, making them ideal for properties with limited installation areas. Their lightweight construction and user-friendly installation features further simplify the process, ensuring that homeowners and professionals alike can set them up with ease.

The BTH models are equipped with advanced control systems that offer precise temperature adjustment capabilities. Users can easily customize their hot water settings to meet specific household or business requirements. This adaptability is supported by the built-in digital display, which provides real-time information about the operating status of the unit.

Safety is a key consideration in the design of the BTH 300A and BTH 400A. They feature a robust set of safety mechanisms, including temperature lockout and venting safeguards, ensuring reliable operation and peace of mind for users. A.O. Smith also understands the importance of longevity in water heaters, and these models are built with high-quality materials, making them resistant to corrosion and wear over time.

In terms of performance, both the BTH 300A and BTH 400A models deliver exceptional heating capabilities, capable of meeting high demands while maintaining efficiency. With customer satisfaction at the forefront, A.O. Smith backs these units with an extensive warranty, demonstrating their commitment to quality and long-term performance.

In summary, the A.O. Smith BTH 300A and BTH 400A water heaters exemplify the marriage of innovation and functionality. With their energy-efficient operation, customizable settings, compact design, and advanced safety features, these models are a compelling choice for those in need of reliable and effective hot water solutions.
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