Ao-smith BFC - 28 User Manual download pdf (Page 77)

Release R.1.3 UK 77

Warning

Maintenance may only be performed by a qualified service and maintenance engineer.

F04 (lock out error)

Three unsuccessful

ignition attempts.

No gas. 1. Open the main gas valve and/or the gas valve before the gas

control.

2. Check supply pressure to the gas control.

3. If necessary, repair the gas supply.

To repair the gas supply, contact your installer.

Air in the gas pipes. Bleed the air out of the gas pipe. See ’3.11 Checking the supply pressure and burner pressure’ for

how to bleed air from the gas line, and measure the supply

pressure and burner pressure.

To replace the necessary parts, you must contact your installer.

No burner pressure. 1. Check the burner pressure at the gas control.

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

3. If necessary, replace the gas control.

Defect in the glow

igniter circuit.

1. Check that the glow igniter is correctly connected (JP2).

2. Check the wiring of the glow igniter.

3. Measure the resistance across the glow igniter. This must lie

between 2 and 5 Ω.

4. Check that the glow igniter lights up during ignition.

5. If necessary, replace the glow igniter.

If the error persists, contact your installer.

To replace the necessary parts, you must contact your installer.

Defect in the ionisation

circuit.

1. Check that the ionisation rod is correctly connected (JP2).

2. Check the wiring of the ionisation rod.

3. Measure the ionisation current. This must be a minimum of 1.5

µA.

4. If necessary, replace the wiring.

Supply voltage too low Check the supply voltage to the appliance. This must be 230 VAC

(+10% -15%).

Table 10.2 Displayed errors (Sheet 5 of 10)

Code + Description Possible cause Solution Remark

1 2 ... 72 73 74 75 76 77 78 79 80 81 82 ... 95 96

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Ao-smith BFC - 28 User Manual Page 77