Wallstar Oil Boiler located in kitchen
Honeywell V4073A 3 port mid pos Valve
Grundfos pump under 3 port valve.
Honeywell ST6400C programmer
Honeywell L641A cylinder stat
No room stat!
1) OK this system was in before we moved in 6 years ago, no change to anything. We have never been able to have the CH on without HW. When I select the CH on programmer, the light comes on but boiler does not fire up nor the pump in airing cupboard, it only fires up when the HW is also selected (or HW on it's own). Also the digital display on programmer has never worked properly (bit of digits missing)
I've Checked 3 port valve, seems OK (can move by hand). Actuator seems to be moving OK - when CH and HW is selected (pump only kicks in when HW selected)
Suspect it's probably not been wired up correctly from day one or Valve/header fault??
2) Also water is very hot and has been for quite some time (temp set to 60c) - suspected cylinder stat, but I think it's OK as turned it down to 40 last night and water was cooler - but it's red hot if left on 60. Is this normal? - due to fact that water is on all day when CH is on?
3) Also had very hot water in F&E tank over weekend and was overflowing - hot water was entering tank from vent pipe! I emptied tank (was rust-coloured water which is worrying) and refilled, turned pump down to 2 (I turned it up to 3 recently as a few rads downstairs were taking a while to come on). Problem looks to be resolved, checked again today OK - cold clear water in tank and cold vent pipe.
do you think these are linked issues? Do I need to drain down and clean?
Honeywell V4073A 3 port mid pos Valve
Grundfos pump under 3 port valve.
Honeywell ST6400C programmer
Honeywell L641A cylinder stat
No room stat!
1) OK this system was in before we moved in 6 years ago, no change to anything. We have never been able to have the CH on without HW. When I select the CH on programmer, the light comes on but boiler does not fire up nor the pump in airing cupboard, it only fires up when the HW is also selected (or HW on it's own). Also the digital display on programmer has never worked properly (bit of digits missing)
I've Checked 3 port valve, seems OK (can move by hand). Actuator seems to be moving OK - when CH and HW is selected (pump only kicks in when HW selected)
Suspect it's probably not been wired up correctly from day one or Valve/header fault??
2) Also water is very hot and has been for quite some time (temp set to 60c) - suspected cylinder stat, but I think it's OK as turned it down to 40 last night and water was cooler - but it's red hot if left on 60. Is this normal? - due to fact that water is on all day when CH is on?
3) Also had very hot water in F&E tank over weekend and was overflowing - hot water was entering tank from vent pipe! I emptied tank (was rust-coloured water which is worrying) and refilled, turned pump down to 2 (I turned it up to 3 recently as a few rads downstairs were taking a while to come on). Problem looks to be resolved, checked again today OK - cold clear water in tank and cold vent pipe.
do you think these are linked issues? Do I need to drain down and clean?
