Background.
System had a leak at the first joint below the Grundfos pump, which was fixed by a plumber friend of a friend. System ran fine when tested immediately after the repair. Plumber left. That evening when the HW and heating should have kicked in, we noticed that the boiler wasn't running. The only thing we noticed was that the pump was bloody hot. Tried to reset the boiler, but this didn't work, so we deselected HW and heating on the control panel.
Called plumber and he suggested it was just air in the system and once everything had cooled, select heating only and reset the boiler but leave the boiler temperature set to low. This worked. After about 10 minutes in this configuration boiler temp was turned up to normal and HW was selected on. Everything was normal apart from 2 rads in the house not getting hot. After a couple of days, and work permitting, I decided to tackle the rads that weren't getting hot.
Bled them, but there wasn't any air in them. Turned the taps off and on, but still no flow through. Turned taps off, disconnected pipes at rad entry points, drained them down, no sludge came out. Opened taps to see if we had a flow to the rads and we did. Reconnected pipes, filled and bled rads. Turned system on and HW and heating worked normally, all rads were hot. System worked for 1 day.
Next morning, boiler had not fired up again. Tried the plumbers trick of resetting the boiler on a low temp setting and selecting heating only but it's still not working.
It goes through the start up sequence, lights for about 15 seconds, but cuts out at the point were it would normally 'accelerate' to full burn. Boiler is only 1 year old.
Any advice please?
System had a leak at the first joint below the Grundfos pump, which was fixed by a plumber friend of a friend. System ran fine when tested immediately after the repair. Plumber left. That evening when the HW and heating should have kicked in, we noticed that the boiler wasn't running. The only thing we noticed was that the pump was bloody hot. Tried to reset the boiler, but this didn't work, so we deselected HW and heating on the control panel.
Called plumber and he suggested it was just air in the system and once everything had cooled, select heating only and reset the boiler but leave the boiler temperature set to low. This worked. After about 10 minutes in this configuration boiler temp was turned up to normal and HW was selected on. Everything was normal apart from 2 rads in the house not getting hot. After a couple of days, and work permitting, I decided to tackle the rads that weren't getting hot.
Bled them, but there wasn't any air in them. Turned the taps off and on, but still no flow through. Turned taps off, disconnected pipes at rad entry points, drained them down, no sludge came out. Opened taps to see if we had a flow to the rads and we did. Reconnected pipes, filled and bled rads. Turned system on and HW and heating worked normally, all rads were hot. System worked for 1 day.
Next morning, boiler had not fired up again. Tried the plumbers trick of resetting the boiler on a low temp setting and selecting heating only but it's still not working.
It goes through the start up sequence, lights for about 15 seconds, but cuts out at the point were it would normally 'accelerate' to full burn. Boiler is only 1 year old.
Any advice please?