Morning all,
I've been trawling this and other forums looking for the solution to my problem but never quite found it, so I thought I'd ask.
Here goes, I'll list everything I've noticed and tried...
I've recently moved into a three year old house with an Ideal ICOS HE15 boiler on what I take to be an S-plan setup (separate valves for CH and HW). I also have the Hive Active Heating controller.
My overrun problem is as follows:
HW is on a schedule and has been running nicely for the last six months. When the HW demand is satisfied, the boiler shuts off and the pump stops. No problem there.
CH works and heats the house but when it switches off, the pump will just keep going and going. Earlier today for instance, the HW was on between 5 and 6 am (no excessive overrun, checked at 6:20) but when the heating schedule finished (7 to 7:30) the pump was still running two hours later.
I think I've eliminated the valves and actuators because if I briefly cycle the heating on/off using the Hive controller, the pump stops there and then. The overrun only happens when the CH has had chance to get up to temp.
I understand the need for some overrun to dissipate heat in the exchanger etc. but this doesn't seem right. The bypass circuit is hand-hot during this, but the rads are luke warm.
While this CH overrun is happening the boiler is not doing anything. The fan eventually runs down and it shows 'C' on the display, while the burner light flashes (not really sure what this means, user manual says 'ignition'). The boiler reset button doesn't seem to work at this point but switching the power off and back on stops the pump.
That's everything I know, all of it gleaned from the internet; I have no experience with heating systems. I've got half an idea that my boiler has some sort of thermostat which monitors the bypass circuit and that this may need replacing but I'm pretty much out of my depth here and it may just be that I don't fully understand how my system works. I don't really want to have to call somebody out just for them to tell me that it's all ok and I'm fretting over nothing.
Picture of HW cylinder if it helps. It wasn't installed this way, it's the picture that is sideways...
Thanks in advance.
I've been trawling this and other forums looking for the solution to my problem but never quite found it, so I thought I'd ask.
Here goes, I'll list everything I've noticed and tried...
I've recently moved into a three year old house with an Ideal ICOS HE15 boiler on what I take to be an S-plan setup (separate valves for CH and HW). I also have the Hive Active Heating controller.
My overrun problem is as follows:
HW is on a schedule and has been running nicely for the last six months. When the HW demand is satisfied, the boiler shuts off and the pump stops. No problem there.
CH works and heats the house but when it switches off, the pump will just keep going and going. Earlier today for instance, the HW was on between 5 and 6 am (no excessive overrun, checked at 6:20) but when the heating schedule finished (7 to 7:30) the pump was still running two hours later.
I think I've eliminated the valves and actuators because if I briefly cycle the heating on/off using the Hive controller, the pump stops there and then. The overrun only happens when the CH has had chance to get up to temp.
I understand the need for some overrun to dissipate heat in the exchanger etc. but this doesn't seem right. The bypass circuit is hand-hot during this, but the rads are luke warm.
While this CH overrun is happening the boiler is not doing anything. The fan eventually runs down and it shows 'C' on the display, while the burner light flashes (not really sure what this means, user manual says 'ignition'). The boiler reset button doesn't seem to work at this point but switching the power off and back on stops the pump.
That's everything I know, all of it gleaned from the internet; I have no experience with heating systems. I've got half an idea that my boiler has some sort of thermostat which monitors the bypass circuit and that this may need replacing but I'm pretty much out of my depth here and it may just be that I don't fully understand how my system works. I don't really want to have to call somebody out just for them to tell me that it's all ok and I'm fretting over nothing.
Picture of HW cylinder if it helps. It wasn't installed this way, it's the picture that is sideways...
Thanks in advance.