My economy7 timer box doesnt is not working properly. The make is horstmann. I normally have the hot water on continueous. But it now it only works with the boost mode twisted round for one hour. The water tank has 2 elements top & bottom. The unit seems to be working ok, the off peak light works and the boost light works and the clock ticks round. But i just doesnt heat the water without using the boost mode
Can anyone help me

Matt, January 2012

Timer box not repairable replace with new one,look like is faulty

ltd, January 2012