Hot water from expansion pipe
- Thread starter stevied123
- Start date
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try turning thermostat down on boiler see wot happens
just checked it and still hot clear water at a rate of one litre a minute on speed 1 from pump. Level on F/E cistern still staying same.
Have tried turning thermostat down on boiler before. Have noticed as soon as boiler fires up from cold, water almost immediatly starts to come from expansion pipe on F/E cistern
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does heating and hot water work o.k
yes they are both fine.
is pump arrow pointing towards the three port
best way i can explain it is: the arrow on pump is going towards three port valve approx 2 ft. The feed and vent pipes are approx are two ft before entering pump.
What is the height of the expansion pipe? i.e. Is it rasied well above the tank and then drops in the shape of a big U or does it only just go over the edge of the tank with the end just above the water line? If it's the latter, then this could be the cause of the recycling of water. You need to raise the expansion pipe well above the tank to stop this from happening and set the pump to mark 1.
it is raised above the F/E cistern then into a U into cistern
All seems perfectly clear to me, which means I've probably misread, so sorry.
There's a blockage between the vent and feed. WHich is common. That means that the pressure on the bottom of the vent pipe is higher than that at the bottom of the feed pipe.
The pump develops a few metres head. If the top of the loop of the vent pipe is say 300mm above the level of water in the tank, then that's all the extra pressure it takes to pump over.
Hard blockages are often not shifted by powerflushing, you have to cut the pipe out. But if the pipe to the pump is straight, you could possibly poke someting back up the pipe (like 15mm pipe or a long drill bit) to dislodge it.
To prove the point get yerself a magnetic pick-up tool. It'll probably stick to the pipe where the blockage is because of the ferrous content of the grot.
If you have a wet-vac then try sucking at the vent pipe with the pump off, you might be lucky. Then try blowing (air) down the vent pipe - with a lid on the f/e tank or you'll get wet, but again you might dislodge something.
If that doesn't work, how old is the pump and do you have an sds drill?
There's a blockage between the vent and feed. WHich is common. That means that the pressure on the bottom of the vent pipe is higher than that at the bottom of the feed pipe.
The pump develops a few metres head. If the top of the loop of the vent pipe is say 300mm above the level of water in the tank, then that's all the extra pressure it takes to pump over.
Hard blockages are often not shifted by powerflushing, you have to cut the pipe out. But if the pipe to the pump is straight, you could possibly poke someting back up the pipe (like 15mm pipe or a long drill bit) to dislodge it.
To prove the point get yerself a magnetic pick-up tool. It'll probably stick to the pipe where the blockage is because of the ferrous content of the grot.
If you have a wet-vac then try sucking at the vent pipe with the pump off, you might be lucky. Then try blowing (air) down the vent pipe - with a lid on the f/e tank or you'll get wet, but again you might dislodge something.
If that doesn't work, how old is the pump and do you have an sds drill?
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