I do apologise for posting in the wrong section. Thanks Gary

Hi all. Ill try to sum this up quickly. My mother had her kitchen replaced 14months ago & her cooker was replaced with a brand new electric unit. The guy who did the job was a reputable kitchen installer. Everything was fine until 2 weeks ago when the lower oven basically exploded. Im a qualified auto electrician & although this is a totally different kettle of fish (so to speak) it was obvious to me that the cooker element had ruptured for no apparent reason. This in turn caused her cookers main power fuse in her fuse box to blow. Anyway she checked her guarantee & found out it has a 5 year parts & labour warranty so she called the company & a week later the engineer came out & changed the Element. The builder who installed the kitchen has no blame in any of this. But this is the part that puzzled me. The engineer from the cooker manufacturer didn't check or replace the main fuse in her fuse box but said "sorry love. That's not my department". Then went on his way saying the cooker would be fine. 2 days ago i went over & replaced my mom's 30amp fuse & we tested the cooker out. It worked fine for 1 minute until we switched the lower over on & then it exploded with an almighty flash again. I opened the door & could see the new element had a hole in it just like the original. My argument is how could the engineer say the cooker was now fine without testing it. Ok if my mom had a trip board then i suppose it would be easy for the engineer to flick a switch. Surely this engineer would be qualified to replace a small piece of 30amp fuse wire ? Anyway - she called the company again & has to wait another week for an engineer to come out. Ive just looked through the guarantee & notice a small section saying "Products over one year old that are considered beyond repair or uneconomical to repair are not subject to exchange/refund or compensation". Although the company have not said the cooker is 'beyond economical repair' as yet. Im not confident in the appliance being safe if the element is changed again. Do you think she would have any kind of right to insist on the cooker being replaced ? Even though it is 14 months old. They are happy enough to charge £400 to supply the appliance. I would expect a damn site more than 14 months for my money. She has been without a cooker for almost 3 weeks now & although she is youthful she is still in her mid 60's. Any advice would be appreciated, so we can arm ourselves if the company quote the clause i found in their warranty. Many thanks Gary Birmingham.