DeDietrich MODULENS O PRO PFC 90 Manual

BE 1/2 IT2688-en
Technical Information
MODULENS O PRO
PFC 90 – PFC 120
Maintenance made easier : operating mode with only one burner
JS N° IT2688-en 12/03/2020
1. Purpose
The PFC 90 and PFC 120 boilers being equipped with two burners, in the case of required maintenance, the
continuity of production of heating and domestic hot water can be ensured, thanks to the single burner operating
mode.
This operating mode can be used in the following cases :
-Shutdown of the boiler following a fault on one of the burners, which requires its shutdown
-Boiler shutdown following a fault other than on the burners, for example : temperature sensor, flue gas
pressure switch, etc...
-Intervention on one of the burners requiring its temporary shutdown (part replacement, ...)
2. Procedure
1. Select the icon to access the installer level.
2. Enter the code 0012
The insataller level is activated and the icon is displayed,
3. Select the Boiler icon on the display to access the « Oil-fired boiler » menu.

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4. Select menu Parameters, counters, signals,
5. Then Adv. Parameters
6. Select the line Burners strategy (parameter AP086)
7. The parameters Burner auto (factory setting), Burner 1 and Burner 2 are displayed.
8. Select the burner which must remain in operation : Burner 1 (= left burner) or Burner 2 (= right burner),
then confirm.
9. Wait a few seconds, until the display shows Burners strategy and the selected burner Burner 1 (for
example).
10. Go back to the home screen by pressing the return key several times
11. If an error code was displayed, select the icon, then press and hold the rotary button for a few
seconds to reset the functions of the appliance : The display will show:
«Operational mode changed, returning to main menu » and
« Connecting to system, please wait... ».
The error code A0272 remains displayed in the Errors menu during the period of operation in
" degraded " mode.
12. The selected burner restarts, the green light on the control panel flashes, and the following message is
displayed : « The appliance is used in a degraded mode, not all functionalities are used ».
13. Hide the message by pressing the return key .
3. Procedure to return to normal operation with 2 burners
1. Select the icon to access the installer level.
2. Enter the code 0012
3. The insataller level is activated and the icon is displayed,
4. Select the Boiler icon on the display to access the « Oil-fired boiler » menu
5. Select menu Parameters, counters, signals,
6. Then Adv. Parameters
7. Select line Burners strategy (parameter AP086),
8. The parameters Burner auto, Burner 1 and Burner 2 are displayed.
9. Select parameter Burner auto, then confirm.
10. Wait a few seconds, until the display shows Burners strategy - Burner auto
11. Go back to the main screen by pressing the back key
12. If an error code was displayed, select the icon, then press and hold the rotary button for a few
seconds to reset the functions of the appliance.
Possible confusion : be careful not
to choose the line « Chimney burner
selec » (parameter OP044) located
a few lines above !