@ Alfbranch - I have had the same problem; my flash (Metz Mecablitz 36 AF-4) is 16 months old and I contacted the seller (in this case, a reputalbe online photographic shop) first, writing to their customer services department and asking what I must do to send the flash back for repairs.
I quoted the
Sale of Goods Act in my letter, stating that the lifespan of the flashgun was clearly well below the expected lifespan of such an item. I got an immediate reply from the seller saying that I should fill in a returns form and that under their terms and conditions, the flash would be repaired free of charge.
However, the Sale of Goods Act is relevant only if you are in the UK. It is the SELLER's responsibility not the manufacturer's to fix something (as they are acting as agents for the manufacturers); what I would do is write/email the customer services department of the store where you bought your flash, explain that you have taken due care of the flash as per the manufacturer's advice and that you are not happy that the flash and can they advise you how to send the flash back for repairs.
In most cases, if the flash is older than 24 months, you will probably have to pay a nominal fee to have it fixed. Because my flash is less than 24 months old, it is being done free of charge. All it is costing me is the recorded delivery charge to send it back to the seller.
Know your rights as a customer: if you are indeed in the UK, and a polite letter/email to the seller does not result in a response, email them again, and if there still is no response, you could contact the Citizens Advice Bureau regarding your options of taking the seller to the small claims court.
I hope this helps. Have a look at this link for further advice:
http://www.direct.gov.uk/en/Governme...ghts/DG_182935 or this one about the seller's responsibilities
http://whatconsumer.co.uk/shops-responsibility/
Regards,
Denise