T
TonyK81
Hi,
We have a weird situation with our HW/CH system. When there's a demand for either of them, the boiler tries to switch on, I see the green light (firing the gas) switching on for approx 10 sec, then switches off. At the moment, we have the controller in the following position:
- HW always on
- CH off (controlled by wireless room thermostat)
Compartments:
- Honeywell ST400C main controller
- Digistat SCR + RF3 wireless thermostat controller
- Honeywell V4073 3-way valve
- L641A Cylinder Stat
- Worcester Greenstar 12Ri boiler
- Grundfos pump
The pump makes a continuous sound as if it's working, but not the usual sound it used to make. I have a feeling that there's air in the system. Why? A couple of days ago I realized that one of the radiators was pretty cold, so I used the key and emptied the air from it. I had done that again just 1.5 month ago.
Furthermore, there is a small "overflow" pipe right next to the tank (right after the B-position of the valve). Whenever I unscrew that (there's a tiny hole there), there's no water coming out of it. It's completely dry. Also, the last couple of days we would hear weird noises from the pipesystem. As if water is dripping inside of them, though there is no leakage. So I believe it's some air in the system, and the dripping sound is from the water moving around inbetween air masses.
My guess is this: The pipe leading to the boiler has air, so the boiler kinda realizes that and switches off. I also guess that the pipe coming back from the boiler to the pump has air (it's completely cold at the moment), and the pump just runs without pumping water really, but it's just air inside it. That's why it makes a different kind of noise. This is the input pipe AB. Then output pipe B which leads to the tank, probably only has air now, that's why the overflow pipe is so dry.
Question is, what do we do if there is air indeed? Do we have to call a plumber for this issue? Or is it a boiler problem, and we have to call a gas engineer instead?
More importantly, how would air come into the system? What malfunction would that indicate?
As a note, we keep switching on and off the boiler regularly, since we generally had some issues with the CH/HW system, which we haven't completely solved yet
(that's a link to the previous issue we had:
http://www.ukplumbersforums.co.uk/c...-stopping-honeywell-v4073-greenstar-12ri.html )
Any help is very much appreciated, since I'm afraid we're gonna run out of hot water very soon, as soon as the tank empties!
Thanks
We have a weird situation with our HW/CH system. When there's a demand for either of them, the boiler tries to switch on, I see the green light (firing the gas) switching on for approx 10 sec, then switches off. At the moment, we have the controller in the following position:
- HW always on
- CH off (controlled by wireless room thermostat)
Compartments:
- Honeywell ST400C main controller
- Digistat SCR + RF3 wireless thermostat controller
- Honeywell V4073 3-way valve
- L641A Cylinder Stat
- Worcester Greenstar 12Ri boiler
- Grundfos pump
The pump makes a continuous sound as if it's working, but not the usual sound it used to make. I have a feeling that there's air in the system. Why? A couple of days ago I realized that one of the radiators was pretty cold, so I used the key and emptied the air from it. I had done that again just 1.5 month ago.
Furthermore, there is a small "overflow" pipe right next to the tank (right after the B-position of the valve). Whenever I unscrew that (there's a tiny hole there), there's no water coming out of it. It's completely dry. Also, the last couple of days we would hear weird noises from the pipesystem. As if water is dripping inside of them, though there is no leakage. So I believe it's some air in the system, and the dripping sound is from the water moving around inbetween air masses.
My guess is this: The pipe leading to the boiler has air, so the boiler kinda realizes that and switches off. I also guess that the pipe coming back from the boiler to the pump has air (it's completely cold at the moment), and the pump just runs without pumping water really, but it's just air inside it. That's why it makes a different kind of noise. This is the input pipe AB. Then output pipe B which leads to the tank, probably only has air now, that's why the overflow pipe is so dry.
Question is, what do we do if there is air indeed? Do we have to call a plumber for this issue? Or is it a boiler problem, and we have to call a gas engineer instead?
More importantly, how would air come into the system? What malfunction would that indicate?
As a note, we keep switching on and off the boiler regularly, since we generally had some issues with the CH/HW system, which we haven't completely solved yet
(that's a link to the previous issue we had:
http://www.ukplumbersforums.co.uk/c...-stopping-honeywell-v4073-greenstar-12ri.html )
Any help is very much appreciated, since I'm afraid we're gonna run out of hot water very soon, as soon as the tank empties!
Thanks
. Just to confirm, there's (at least) two pipes I can see that go into the tank. The one is the same that provides the red vessel with the WRAS feed (so I guess that's the main water supply that fills up the tank with the ball valve), and there's also another pipe which seems to be one of the others, and comes into the tank from the top. From the various diagrams it seems it comes from the hot cylinder, maybe as an overflow pipe to put water back in the tank for safety.