M
MichaelwGroves
I have been getting an E9 error for a few years. We have replaced a many parts in the system but the fault persists. My engineer has replaced the Thermistors, main PCB and Auto purge Vent in the boiler and Worchester Technical are adamant it is not the boiler and must be a problem with the plumbing. On the heating side it is Y Plan vented system, we have replaced valve, Pump and cylinder thermostat. I also had reverse circulation which I fixed recently thanks to this forum.
The boiler is a Worchestwer Bosch Condensing 40CDi
So, to be sure the E9 error is an over heat. So I need to establish what is wrong with the central heating to make the boiler over heat. I've noticed that on hot water only it is fine. When on heating it errors. When I've watched it from cold, if the boiler get to max temperature within 7 minutes it trips. When it takes 15 minutes to hit max temperature it works fine. It only trips on start up. I've also noticed recently that I can bleed my highest radiator daily, expelling 5 seconds of fast air.
So I'm thinking maybe it's sucking in air and this is what causes boiler to trip, but i don't want to lead you.But if so from where?
The current system is made of two halves, origional 22mm copper to 15mm T to radiators. The new part is 22mm Hep2o Mainfolds to 10mm and 15mm to radiators. The pump is a Grundfos Magna 25. When I put this on auto the house does not get hot enough, but the boiler does not trip. So I have to set pump at constant flow No.7
I attach an image which show the layout almost exactly, including T's etc. If it looks wrong it may well be, or maybe an inaccuracy in the drawing. For instance, yes the cylinder is bottom feed!
Yes there is an unconventional vent just before the pump due to old pump being under powered and air getting trapped before the boiler. If it looks wrong please say.
I am really lost with this, Worchester are adamant it's not the boiler, and we have replaced all the parts they thought it might be, but I just can't see what is wrong with the plumbing. Any help would be much appreciated.
Thanks
Michael
The boiler is a Worchestwer Bosch Condensing 40CDi
So, to be sure the E9 error is an over heat. So I need to establish what is wrong with the central heating to make the boiler over heat. I've noticed that on hot water only it is fine. When on heating it errors. When I've watched it from cold, if the boiler get to max temperature within 7 minutes it trips. When it takes 15 minutes to hit max temperature it works fine. It only trips on start up. I've also noticed recently that I can bleed my highest radiator daily, expelling 5 seconds of fast air.
So I'm thinking maybe it's sucking in air and this is what causes boiler to trip, but i don't want to lead you.But if so from where?
The current system is made of two halves, origional 22mm copper to 15mm T to radiators. The new part is 22mm Hep2o Mainfolds to 10mm and 15mm to radiators. The pump is a Grundfos Magna 25. When I put this on auto the house does not get hot enough, but the boiler does not trip. So I have to set pump at constant flow No.7
I attach an image which show the layout almost exactly, including T's etc. If it looks wrong it may well be, or maybe an inaccuracy in the drawing. For instance, yes the cylinder is bottom feed!
Yes there is an unconventional vent just before the pump due to old pump being under powered and air getting trapped before the boiler. If it looks wrong please say.
I am really lost with this, Worchester are adamant it's not the boiler, and we have replaced all the parts they thought it might be, but I just can't see what is wrong with the plumbing. Any help would be much appreciated.
Thanks
Michael