A.O. Smith BFC - 30 Service program, Setting the hysteresis, Displaying the error history

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12 Service program

12.1 Introduction

The service program is used by the installation engineer or service and maintenance engineer for:

•Setting the hysteresis;

•Displaying the error history;

•Displaying the appliance history;

•Display the selected appliance;

•Switching the pump on or off;

•Setting the service interval;

•Setting the display contrast;

•Setting the display backlight time;

•Setting the display scroll speed.

SERVICE MENU

»HYSTERESE

^HISTORY OF ERRORS È APPLIANCE HISTORY

SELECT APPLIANCE

PUMP RELAY

SERVICE INTERVAL

CONTRAST DISPLAY

TIME BACKLIGHT

SCROLLSPEED

These sub-menus are briefly described in the following paragraphs. If you are not familiar in general with how to use the displays and menus, first read the relevant section (7 "The control panel").

Note

The notation convention for the service menu is identical to that of the main menu (11.2 "Notational convention for menu-related instructions"). The

difference is, you use to bring up the service program, instead of which brings up the main menu.

12.2 Setting the hysteresis

If the preset temperature (SETPOINT) is higher than the current water temperature, then the appliance might not immediately start the heating

cycle (9.3 "The appliance's heating cycle"). To prevent excessively frequent switching on and off, there is a heating margin. We refer to this margin as the

hysteresis. The standard setting for this margin is 2°C. The heating cycle starts if the water temperature drops to 2°C below the SETPOINT and ends when the water reaches 2°C above the SETPOINT.

HYSTERESE UP »3ÉC

Set the hysteresis via:

•: HYSTERESE UP

The figure shows an example

Set the hysteresis via:

•: HYSTERESE DOWN

12.3Displaying the error history

Display the error history as follows:

• : HISTORY OF ERRORS

The controller will display an overview of "Blocking errors" and "Lock out errors". In both cases, the electronic controller reserves 15 lines for the last 15 error messages. If there are fewer than 15 error messages, an ellipsis (...) is displayed. The display

first shows the "Blocking errors". When is pressed, the "Lock out errors" are then displayed.

The figure shows an example of "Blocking errors". In this case, the text HISTORY OF ERRORS is followed by (B).

HISTORY OF ERRORS(B)

S04 SENSOR ERROR

F06 IONIZATION

È CO2 50 HZ ERROR

The figure shows an example of "Lock out errors". In this case, the text HISTORY OF ERRORS is followed by (L).

HISTORY OF ERRORS(L) F02 FAN

F07 FLAME ERROR È ...

Note

For an overview of all errors and the possible causes, please refer to the relevant

chapter (13 "Troubleshooting").

Instruction manual BFC 67