Vent-Axia VACSH 24A - too hot in the morning - not able to adjust the input power

Hi all,

I'm new to this forum and this is my first post

I have Vent-Axia VACSH 24A  storage heater. 

http://www.vent-axia.com/product/optimax-combination-storage-heaters-vacsh-24a.html

http://www.vent-axia.com/files/pdf-downloads/438941 A.pdf

It seems that something is wrong with storage heater because it always takes the max input power during night (around 25kW). There is no difference if I change the input control to 1 or to 5 - heater is always too hot in the morning and electricity consumption is always same. 

Is it a problem with faulty thermostat? 

Any advice?

Many thanks!

Have you followed the commissioning procedure? 

Is yours the automatic model? 

Sharpend said:

Have you followed the commissioning procedure? 

Is yours the automatic model? 

Click to expand...

Yeah - it is the automatic model (VACSH 24A).