new alarm fob coding

[buster uk]

hi all
i have bought an alarm fob off ebay but cant get it to work.
Its the correct 418 mhz fob and the little LED light on it works.
I have done the procedure to code the new fob and the horn churps and the dash LED stay lit.When i hold the button down on the fob the dash LED should go out,but it doesn't.After 2 mins it resets.The alarm works with the key but cant get the damn fob to work.
Do i need 2 new hand sets or what else could be wrong.

help appreciated as im pulling my hair out.
thanks
andy

[muddyweb]

Is the battery in the new fob a new one ?

[buster uk]

yeah,i even tried 2 batteries.The LED does look faint.I wonder if i have the correct type .
I just went to the shop and got one to fit.

Maybe its the wrong voltage ??
Anyone know what battery should be in it ?

[Wanderer]

Sometimes the battery connection corrode and a quick clean can get it working again. I use a bit of IPA (Isoprophyl Alcohol) on a cotton bud first.

HTH
Ed

[buster uk]

its a brand new fob though

[buster uk]

its sorted now.I had the wrong voltage battery in it.
I had a 1.5 v battery in it and it needed a 3 v one.

thanks to those who bothered trying to help.