vaillant f 62 fault code how to test

[Gary80gas]

Hi all, ive got a call to look at a vaillant ecotec with an f 62 fault tomorrow. Its a gas valve fault not closing properly but it also could be the pcb causing the same problem.
Can anyone advise me.
Is there a simple test to be sure its the gas valve or the pcb that needs changing. Thanks in advance.

 

[Burger]

Hi Gary,

What I usually do, others will correct me if I’m wrong, check the pins on the gas valve for resistance, if there is resistance then it’s generally going to be the pcb. You can also check continuity of the harness to pcb, but it’s usually ok. You can also check the voltage from pcb to gas valve, these are on the Vaillant website.

Try this link (not sure if it will work)

Ask Vaillant | Domestic Boilers | Vaillant

Thanks,
CBW.

 

[AMGasServices]

Vaillant will say change the PCB. 9 times out of 10 it’s the PCB.

You could do a tightness test on the gas valve to confirm its closing.

 

[moonlight]

I had a problem with the same fault. Rang Vaillant technical. I had a very helpful person, who said to check the plug on the board, I cant remember which ones or the voltage you should get. Give them a ring in the morning. Good luck.

 

[Gary80gas]

Thanks for advice. I was suppose to be finishing another installation and pushed for time, so I just hit the boiler reset and it all fired up ok. I rang them the next day and all still working with no error messages. I told them this was not a real fix and to call me as soon as it reoccurs. Hopefully when i'm not so stretched. Ta.

 

[Burger]

Thanks for advice. I was suppose to be finishing another installation and pushed for time, so I just hit the boiler reset and it all fired up ok. I rang them the next day and all still working with no error messages. I told them this was not a real fix and to call me as soon as it reoccurs. Hopefully when i'm not so stretched. Ta.

No problems, but in my experience it will go again.

 

[Timmy D]

Might be off here, but some older boards have a 5v contact at one of the corners. Test for voltage across this pin.

Should tell you if the board is the issue.