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Thanks, hopefully a simple fix then. Should you be able to see it moving or be able to push it by hand? May just get a whole pump (can get one tomorrow vs just a valve which will take a few days), then swap the valve for now and arrange for someone to come and set up the new pump (swapping it...

Well this is the system that keeps on giving. Followed the kind advice here and converted it to a 2 pipe system with a tiger loop and laying the NRV horizontally. This on the whole worked but was still getting the occasional lock out (maybe once every 10 days or so). We then had the cold...

One question, there is the wheel on the NRV which I assume is the fire valve. Should that be screwed all the way out, all the way in or some other position?

Thanks, will see if it continues to draw air and speak to the engineer when I can get one to come about a tiger loop.

Thanks Exedon for the response. To update, I have got it fired up now. Will have to see if it is still leaking air. What I had to do was to release an air lock in the pump (I assume). So rather than the top bleed valve at the front which removes the air from the line, I had to knock off the...

If it helps, inside and outside pictures where hot water is being called for but locked out.

Hi all, Have an HRM Wallstar oil boiler which has started playing up. Think its a 12/14 or 12/15 boiler. It locked out the other day and the oil line to the boiler was full of air. Bled that and it started to increase again so following some of the threads on here I have replaced the non...

OK, an update in case it is useful to anyone else with the same system. Once you start labelling up and removing wires it becomes quite clear which are just trigger wires from the thermostat. Wiring ends up being: Both Earth wires transfer to the Hive Earth tether The Danfoss N (Neutral)...

Hi All, After some advice if I may. My existing Danfoss FP975 controller has died again (second one in 4 years to die). So decided time to move to something a bit more intelligent and have purchased the Hive Active. It is a 2 channel system with a Danfoss remote thermostat. Wiring of the...

Thanks for that, was along the lines of what I suspected. Any particular model of Grundfos recommended, needs to be suitable for a micro bore system?

The pump on our central heating stopped working. Whilst having a look to see where the fault could be I found that pushing gently on the speed setting switch the pump would activate. The pump is a PTS Pump 5 (6 bar IP42). Is this a know issue and easy to fix, or is it a replacement pump...