Vaillant Ecotec F70
The meaning of this fault code F70 or F.70 according to the vaillant installation and servicing manual is as follows:
Invalid device specific number (DSN) | Spare part case: Display and PCB replaced at same time and DSN not set, wrong or missing output range coding resistor |
It is applicable to several vaillant models as well as some other brands of the Vaillant Group such as Glowworm. The main models are Ecotec Plus, Ecotec Pro, Turbomax, Ecotec Exclusive and a few more.
F.70 Cause
The 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 / Repair
Once 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. 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) Table
The 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.
Model | Appliance Type | Year | Appliance DSN |
---|---|---|---|
Ecotec Plus 612 | 2005-2012 | 0 | |
Ecotec Plus 615 | 2005-2012 | 1 | |
Ecotec Plus 618 | 2005-2012 | 2 | |
Ecotec Plus 624 | 2005-2012 | 3 | |
Ecotec Plus 630 | 2005-2012 | 4 | |
Ecotec Plus 637 | 2005-2012 | 5 | |
Ecotec Plus 824 | 2005-2012 | 6 | |
Ecotec Plus 825 | 6 | ||
Ecotec Plus 831 | 2005-2012 | 7 | |
Ecotec Plus 832 | 10 | ||
Ecotec Plus 835 | 62 | ||
Ecotec Plus 837 | 2005-2012 | 8 | |
Ecotec Plus 838 | 17 | ||
Ecotec Plus 937 | 2005-2012 | 8 | |
Ecotec Plus 938 | 10 | ||
Ecotec Exclusive 832 | 2007-2016 | 4 | |
Ecotec Exclusive 838 | 2007-2016 | 5 | |
Ecotec Plus 415 | 2006-2015 | 11 | |
Ecotec Plus 418 | 2006-2015 | 12 | |
Ecotec Plus 428 | 2006-2015 | 13 | |
Ecotec Plus 438 | 2006-2015 | 14 | |
Ecotec Pro 24 | 2005-2012 | 7 | |
Ecotec Pro 28 | 2005-2012 | 0 | |
Ecotec Pro 24 | 2012-2015 | 7 | |
Ecotec Pro 28 | 2012-2015 | 8 | |
Ecotec Plus 612 | (VU GB 126/5-5) | 2012-2015 | 1 |
Ecotec Plus 615 | (VU GB 156/5-5) | 2012-2015 | 3 |
Ecotec Plus 618 | (VU GB 186/5-5) | 2012-2015 | 4 |
Ecotec Plus 624 | (VU GB 246/5-5) | 2012-2015 | 9 |
Ecotec Plus 630 | (VU GB 306/5-5) | 2012-2015 | 14 |
Ecotec Plus 637 | (VU GB 376/5-5) | 2012-2015 | 20 |
Ecotec Plus 824) | (VUW GB 246/5-5 | 2012-2015 | 6 |
Ecotec Plus 831 | (VUW GB 316/5-5) | 2012-2015 | 10 |
Ecotec Plus 837 | (VUW GB 376/5-5) | 2012-2015 | 17 |
Ecotec Plus 937 | 2012-2015 | 17 | |
Ecotec Plus 612 | (VU GB 126/5-5 A) | 2015- | 1 |
Ecotec Plus 615 | (VU GB 156/5-5 A) | 2015- | 3 |
Ecotec Plus 618 | (VU GB 186/5-5 A) | 2015- | 4 |
Ecotec Plus 624 | (VU GB 246/5-5 A) | 2015- | 9 |
Ecotec Plus 630 | (VU GB 306/5-5 A) | 2015- | 14 |
Ecotec Plus 637 | (VU GB 376/5-5 A) | 2015- | 20 |
Ecotec Plus 825 | (VUW GB 256/5-5) | 2015- | 6 |
Ecotec Plus 832 | (VUW GB 326/5-5) | 2015- | 10 |
Ecotec Plus 835 | (VUW GB 356/5-5) | 2015- | 13 |
Ecotec Plus 838 | (VUW GB 386/5-5) | 2015- | 17 |
Ecotec Plus 937 | 2015- | 17 | |
Ecotec Pro 24 | (VUW GB 306/5-3) | 2015- | 7 |
Ecotec Pro 28 | (VUW GB 306/5-3) | 2015- | 22 |
Ecotec Pro 30 | (VUW GB 306/5-3) | 2015- | 26 |
Ecotec Plus 46KW Old Type | (VUW GB 466/4-5 H) | Pre 2012 | 46 |
Ecotec Plus 46KW Old Type | (VUW GB 466/4-5 A) | Pre 2012 | 46 |
Ecotec Plus 65KW Old Type | (VUW GB 656/4-5 H) | Pre 2012 | 47 |
Ecotec Plus 65KW Old Type | (VUW GB 656/4-5 A) | Pre 2012 | 47 |