Astra Dti (starting problems)

Hello friends, I tell you that I continue with cold starting problems with my astra dti. A few days ago I received in response how to try the preheating spark plugs. I did it and in fact none was. They change them all. It worked perfect until yesterday ... When I went to launch, the preheating indicator did not ignite, I thought I didn't miss, I started and cost him ... and so from that moment. I do not want to spend on the timer without knowing if that is what does not work, or it is something else, I would appreciate any help. ahh look for the timer's relay but no idea what it is ... thanks

Czech again the spark plugs if they are fine is the preheater if they are burned and you put them new you have two options one that are of very poor quality or that the preheater does not cut and burn them, if so you change the teacher.