Technical data

6.4.9 Service code

Only for the heating contractor.

To avoid incorrect settings several operation levels have

protection codes. For service purposes you can program

code C 1 2 .

- Press the 'mode'- and 'step'-keys simultaneously and

the 'code'-display now shows C .

- Holding both keys pressed, set the temperature dis-

play to 1 2 , using the '▲'- and '▼'-keys.

6.4.8 Failure mode (blinking 'code' display)

Only for the heating contractor.

Malfunctions of the boiler control occurring during opera-

tion are shown on the read-out displays (see failure

table in chapter 11). The latest failure is stored in the mi-

croprocessor memory and can be read at service level,

code C 1 2 (see para. 6.4.9).

- Press the 'mode'-key until the digit 1 (blinking)

appears in the 'code'-display.

- Press the 'step'-key for the required code.

Code Description

1 3 7 Display of failure code (chapter 11)

2 0 3 Operating mode during failure

(para. 6.4.2)

3 5 3 Flow temperature during failure

4 4 0 Return temperature during failure

5 6 0 D.H.W. temperature during failure

6 1 0 Outdoor temperature during failure

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- Keep both keys pressed and press the 'store'-key.

The temperature display is blinking to acknowledge

your access to the service setting.

- Press the 'store'-key to store the service code (the

temperature display will blink twice for acknowledge-

ment).

- Release the 'mode' and 'step' keys.

You are in the service mode and are able to change set-

tings and to read out values.

After using the service code you have to delete the ser-

vice code by pressing the 'reset'-key once or after 10

minutes when no further alterations have been made the

service code will delete automatically.

Example:

The return temperature sensor has failed during central

heating operation at a flow temperature of 53°C, a return

temperature of 40°C, a D.H.W. temperature of 60°C and

an outdoor temperature of 10°C.

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