Help needed with Radiator problem

[keane16]

Hi,

I have a Myson Orion Boiler & a Honeywell ST7100 programmer. My house is 20 years old & have a feeling they've been in from the start.

The heating is currently set to come on at 3 various times of the day, but in the morning all the radiators come on except 3 of the 4 downstairs ones. But they come on at the other times of the day.

Also if i put the heating to come on via the 1hr boost on the timer, i get the same problem.

Can anyone help me here as the manual cannot be downloaded from the Honeywell website.

Many thanks

 

[keane16]

Hey all,

Also there's a silver box next to my cylinder upstairs, which has a little lever underneath. i havt to flick this now & again to get my heating to fire up.

Could this be linked to my problem?

 

[welsford46]

Id want to rule out poor flow in the system first...try adding some system cleaner for a week..drain out and refill...turn the pump speed up and see if that helps?