VAILLANT ECOTEC PLUS 612 615 618 624 630 637 PCB WAS. This part fits following boilers: VAILLANT ecoTEC plus.
F.70 CauseThe cause of this error is usually that the PCB which is the same across many models has not been assigned it’s software identity for the model of boiler it is intended for. If the PCB is not assigned this number it cannot operate safely therefore it produces F70.F.70 Solution / RepairOnce you have changed the PCB, enter the Installer Diagnostics menu or second diagnostic level. For older Ecotec models with the round dials, you press i button and + button at the same time.
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Then go to D97 using the – button, press i button once, so that you will see 00. Enter the code 17 using the + button, once reached, hold “i” button until it is accepted. The second diagnostic level is now available.
Then proceed to D93 using the “-” button, press the “i” button to enter this value, change it to the correct DSN according to the table below. Finally hold the “i” button until it is stored and accepted. You may have to reset the boiler, and if this still doesn’t work, you may have to set to factory defaults using D96, setting it to 1, holding “i” so it accepts this.
The boiler should then be reset back to defaults and it should no longer show D70 and start working as normal.DSN (Device Specific Number) TableThe device specific codes are shown in the table below. You can search the table by model name, appliance type ie VUW and also search by the year. The appliance type code is the most accurate way of finding the exact DSN.
We will add further appliance types over time.
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