The red light is on ,but the iron don't get hot

There is an issue with the irons thermostat. You will need to buy a new clothing iron.

You are probably not holding the iron the right way! Don’t hold the iron upside down, or don’t put too much water in at a time. Make sure that the heat on iron is turned up hot enough to burn the water fast enough so it doesn’t leak.

The connection to the resistance might be burned out. disassemble carully, might need soldering.
If you disassemble and don't have experience repairing an iron, take photos for each step. See some videos about iron repairing

Iron Disassembly Process


Iron Repair No Power or Short in cord wire Rowenta Master

How to repair broken iron


Iron Repairing sajid salman flv

If the iron heats but steams improperly, inspect the soleplate and clean the vents (see below) and flush sediment out of the steam chamber (see below).
If the iron produces too much or too little heat, test the electrical cord . Also test and, if needed, adjust calibration of the thermostat .
If the iron does not spray properly, inspect and clean the nozzle (see below).
If the iron leaks or spits, clean the steam vents, nozzle, and tank.
If the iron sticks to fabric, clean or repair the soleplate. If the iron stains fabric, clean the soleplate, clean the tank with a commercial cleaner, and use distilled or filtered water.
God bless you

my iron box doent turn on ...red light and dosent be hot

i have a tesco steam generator iron, model no. sgc2 it has no steam or noise but red stand by light is flashing

I had the same problem and eventually removed the tilt sensor. This is the molded board that you see when you open the back of the iron. By removing it, you will also loose the timer off function. The thermostat will still be operational.

The thermal cutoff device blew and must be replaced. It acts like a fuse when the iron gets too hot. Thay are very
cheap and it would be well worth replacing. Hope this was helpful.
George

Blinking red light is a standby phase, its not going to get hot like this. Shake it or just start ironing, the red light will go solid and the plate will heat up. The red light will go off when the plate is hot enough. It will go on again (solid) after a few minutes to keep the plate at the right temperature. If you leave it standing around for a while it will begin blinking again (standby).

These irons are known for malfunctioning though, mine stays in standby and the plate never heats up! Hopefully yours is fine.