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 (Figure 22)

ECO LED Flashing:

ECO SWITCH OPEN, ECO LED Flashing

FIGURE 22

 

 

 

 

 

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 (Figure 23)

 

 

All LEDs Flashing:

 

 

CONTROL BAD, All LEDs Flashing

FIGURE 23

 

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 (Figure 24)

Pressure Switch LED Flashing:

COMBUSTION AIR BLOCKAGE, Pressure Switch LED Flashing

FIGURE 24

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.

17

Page 16 Page 18
Page 17
Image 17
A.O. Smith BTH 120-250(A) warranty ECO Switch Open Figure, Control BAD Figure, Combustion AIR Blockage Figure
Page 16 Page 18

BTH 120-250(A) specifications

A.O. Smith BTH 120-250(A) is a cutting-edge water heater designed to meet the demands of residential and commercial settings. This high-efficiency unit is equipped with a range of features aimed at maximizing performance and minimizing energy consumption, making it a popular choice among homeowners and builders alike.

One of the standout features of the A.O. Smith BTH 120-250(A) is its energy efficiency. It operates with a thermal efficiency rating of up to 96%, which means that a significant portion of the fuel consumed is converted into usable hot water. This not only reduces energy bills but also lessens the environmental impact of water heating.

The unit employs advanced condensing technology, which captures and utilizes the heat from flue gases that would otherwise be lost in traditional units. This technology allows for lower exhaust temperatures and the potential for venting through PVC, significantly simplifying installation in various settings.

With a capacity range of 120 to 250 gallons, the BTH series is versatile enough to serve different needs. It is suitable for multiple applications, including large residential homes, commercial businesses, and industrial installations. The varying sizes ensure that it can deliver adequate hot water supply, even during peak demand periods.

In addition to its impressive capacity and efficiency, the A.O. Smith BTH 120-250(A) features a user-friendly digital control system. This allows users to easily set and monitor water temperatures, helping to prevent scalding and ensuring consistent comfort. The integrated diagnostics system alerts users to potential issues, facilitating proactive maintenance and reducing downtime.

Another appealing characteristic of this water heater is its durable construction. Built with high-quality materials, it is designed to withstand the rigors of frequent use while maintaining optimal performance over time. Furthermore, it comes equipped with an innovative flame rollback feature, enhancing safety by reducing the risk of flashback.

Overall, the A.O. Smith BTH 120-250(A) stands out in the competitive water heater market due to its exceptional efficiency, advanced technologies, and robust construction. Whether for residential or commercial use, this model provides reliable hot water supply while promoting energy savings and environmental sustainability. Its combination of performance and user-friendly features makes it a top choice for those seeking a reliable water heating solution.
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