Your rights, in respect of faulty goods, are with the retailer, not the manufacturer.
If an appliance proves to be defective
due to a inherent fault (e.g. poor quality components, poor design or poor manufacturing standards) within 6 years from the date of purchase, the retailer is obliged to put things right by either repairing the appliance or replacing it. (The customer can nominate which of these two options he prefers but the retailer can substitute the alternative option if the customer's choice is not economically viable).
Within the first 6 months after purchase there's an automatic assumption (unless there's clear evidence to the contrary) that any problem which develops is due to an inherent fault. Thereafter, it's up to the customer to show (based upon the balance of probabilities) that the most likely cause of the problem is an inherent fault. If you've got evidence from online reviews that there's a well-known problem, you seem to be in a strong position here.
Write to Tesco, explaining the problem and including details of why you believe the problem is due to an inherent fault. Send your letter, by recorded delivery to:
Tesco Customer Service
PO Box 73
Baird Avenue
Dryburgh Industrial Estate
Dundee
DD1 9NF
If you require further advice, contact your local Trading Standards office:
http://www.tradingstandards.gov.uk/search/dbas e/searchlocal.cfm
Chris