A.O. Smith BFC -100, BFC - 80 Code + Description Cause Solution Remark F04 lock out error

Models: BFC - 80 BFC -100

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is

 

 

 

 

 

Code + Description

Cause

Solution

Remark

 

 

 

 

 

 

 

F04 (lock out error)

No gas

1.

Open the main gas valve and/or the manual gas valve supplying

To repair the gas supply, contact your installation engineer

 

Three unsuccessful

 

 

the water heater

 

 

 

2.

Check the supply pressure to the gas control

 

 

ignition attempts.

 

 

 

 

3.

If necessary, repair the gas supply

 

 

 

 

 

 

 

 

 

 

 

 

Air in the gas pipes

Bleed the air out of the gas pipe

See Checking the supply pressure and burner pressure for how to

 

 

 

 

 

bleed air from the gas line, and measure the supply pressure and

 

 

No burner pressure

1.

Check the burner pressure to the gas control

 

 

burner pressure.

 

 

 

2.

Check that the gas valve(s) open and shut correctly

 

 

 

To replace the necessary parts, you must contact your installation

 

 

 

3.

If necessary, replace the gas control.

engineer

 

 

 

 

 

 

 

 

 

 

 

 

Defect in the hot

1.

Check that the hot surface igniter is correctly connected (JP2).

If the error persists, contact your installation engineer.

 

 

surface igniter circuit

2.

Check the wiring of the hot surface igniter.

To replace the necessary parts, you must contact your installation

 

 

 

engineer

 

 

 

3.

Measure the resistance across the hot surface igniter. This must

 

 

 

 

 

 

 

 

lie between 2 and 5 ohms.

 

 

 

 

4.

Check that the hot surface igniter lights up during ignition.

 

 

 

 

5.

If necessary, replace the hot surface igniter.

 

 

 

 

 

 

 

 

 

Defect in the ionisation

1.

Check that the flame probe is correctly connected (JP2)

 

 

 

circuit

2.

Check the wiring of the flame probe

 

 

 

 

 

 

 

 

3.

Measure the ionisation current. This must be at least 1.5

 

 

 

 

 

microamps.

 

 

 

 

4.

Replace the wiring if necessary.

 

 

 

 

 

 

 

 

Supply voltage too low

Check the supply voltage, this must be 230 VAC (-15%, +10%).

 

 

 

 

 

 

 

 

F05 (lock out error)

Incorrect roof or wall

1.

Check that the correct roof or wall flue conduit (3.9 "Air supply

If the error cannot be resolved or is persistent, contact your

 

 

conduit.

 

and flue") has been fitted.

installation engineer

 

Too many flame errors

Recirculating flue

2.

If necessary, install the correct roof or wall conduit.

 

 

have been signalled.

gases.

 

 

3.

Check that the roof or wall conduit discharges into a permitted

 

 

 

 

 

 

 

 

 

area.

 

 

 

 

 

 

 

 

Instruction manual BFC

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Page 76
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A.O. Smith BFC -100, BFC - 80 service manual Code + Description Cause Solution Remark F04 lock out error, F05 lock out error

BFC - 80, BFC -100 specifications

A.O. Smith is a renowned name in the water heater industry, and its BFC series, which includes the BFC-100 and BFC-80 models, exemplifies their commitment to innovation and efficiency. These units are designed to meet the demanding needs of both residential and commercial applications, providing reliable hot water solutions.

The A.O. Smith BFC-100 and BFC-80 are distinguished by their high capacity and robust design. The BFC-100 model boasts a capacity of 100 gallons, while the BFC-80 is ideal for those requiring 80 gallons. This makes them suitable for larger households or commercial establishments where hot water demand can be significant.

One of the primary features of these models is their advanced heating technology. Both units utilize a high-efficiency burner that ensures rapid heating and minimal energy consumption. This means users benefit from shorter wait times for hot water, reducing overall energy costs. The BFC series is also equipped with a special flame retention head that enhances combustion efficiency and prolongs the lifespan of the unit.

In terms of construction, the BFC-100 and BFC-80 models are built with high-quality materials that enhance durability and resistance to corrosion. The tanks are insulated with high-density foam, which improves energy retention and helps maintain water temperature for longer periods. This is crucial for conserving energy and minimizing heating costs.

Safety is a top priority for A.O. Smith, and the BFC series reflects this commitment. Each unit comes with a range of safety features, including a temperature and pressure relief valve that prevents overheating and excessive pressure buildup. Additionally, they are designed to meet strict industry standards, ensuring peace of mind for users.

Installation of both models is straightforward, with flexible venting options that accommodate various building layouts. Whether you are upgrading an existing water heating system or installing a new one, the BFC series is designed to integrate seamlessly.

In summary, the A.O. Smith BFC-100 and BFC-80 are excellent options for those seeking reliable, efficient, and durable water heating solutions. With their impressive capacity, advanced heating technology, robust construction, and safety features, these models stand out in the market and are sure to meet the hot water needs of any household or commercial space. Whether for residential use or in a business setting, A.O. Smith’s BFC series represents quality and innovation in hot water heating.