Service Program; Introduction; Setting The Hysteresis; Displaying The Error History - A.O. Smith BFC-28 Installation, User And Service Manual

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12.1 Introduction

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

Displaying the water heater history;

•

Displaying the error history;

• Displaying the water heater history;
• Display the selected water heater;
• Switching the pump on or off;
• Setting the service interval;
• Service mode;
• Setting legionella prevention.
SERVICE MENU
»HYSTERESIS
^ ERROR HISTORY
È APPLIANCE HISTORY
SELECT APPLIANCE
PUMP RELAY
SERVICE INTERVAL
SERVICE OPERATION
ANTI LEGIONELLA
These sub-menus are briefly described in the
following paragraphs. If you are not generally familiar
with the use of the displays and menus, first read the
relevant chapter (7 "The control panel").
Note
The notation convention for the service menu is
identical to that of the main menu (11.2 "Notation
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 (SET POINT) is higher than
the current water temperature, the water heater might
not immediately start the operating cycle (9.3 "The
appliance's heating cycle"). To prevent excessively
frequent switching on and off, there is a heating
margin. This margin is called the hysteresis. The
standard setting for this margin is 5°C. The operating
cycle starts when the water temperature drops to 5°C
below the SETPOINT and ends when the water
reaches 5°C above the SETPOINT.
HYSTERESIS UP »3ÉC
Instruction manual BFC

Service program

Set the hysteresis as follows:
•
Set the hysteresis as follows
•
12.3 Displaying the error history
Display the error history as follows:
•
The controller will display an overview of "Blocking
errors" and "Lock out errors". In both cases, note that
the 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
"Lock out errors" are then displayed.
The figure shows an example of "Blocking errors". In
this case, the text ERROR HISTORY is followed by
(B).
ERROR HISTORY(B)
È CO2 50 HZ ERROR
The figure shows an example of "Lock out errors". In
this case, the text ERROR HISTORY is followed by
(L).
ERROR HISTORY(L)
È ...
causes, please refer to the relevant
chapter (13 "Errors").
12.4 Displaying the water heater history
The water heater history sub-menu is used to display
the burning hours, the number of ignitions, the number
of flame errors and the number of ignition errors.
: HYSTERESIS UP
The figure shows an example
: HYSTERESIS DOWN
: ERROR HISTORY
S04 SENSOR ERROR
F06 IONIZATION
F02 FAN
F07 FLAME ERROR
Note
For an overview of all errors and the possible
is pressed, the
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