Air in water system

DaveNorthern

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I have recently refilled my fresh water after draining it and cannot get the air out of the sytem.
I thought it may have been the pump which i have replaced along with the bowl filter and i still have the same problem.
It would appear air is getting entrained into the system. Pump runs full speed when taps are open as expected. When the taps are closed it runs for a while as usual then at low rate constantly. Has anyone come across this problem.
 
I have not heard of a pump that still runs with all taps closed. It is a strange fault and sounds like an electrical problem, possibly a faulty microswitch on one of the taps. Or a faulty pressure switch if you have a diaphragm pump.
 
Have you tried running all the taps in the hot position for a while. I had a similar problem as the hot water tank would not fill and the pump ran constantly. Running water in the hot position cleared the problem after a lot of spluttering ( the taps, not me)
Good luck
K ;)
 
With a diaphragm pump air in the system is likely to be caused by a leak between tank and pump. A leak after the pump would show as water leakage. Water is sucked out of the tank by the pump but if there is a small leak it may also suck in some air. Check the joints and valves between tank and pump, if you have a Truma system the elbow valve on the hot water tank is well known for failing after a drain down.
 
Okta said:
With a diaphragm pump air in the system is likely to be caused by a leak between tank and pump. A leak after the pump would show as water leakage. Water is sucked out of the tank by the pump but if there is a small leak it may also suck in some air. Check the joints and valves between tank and pump, if you have a Truma system the elbow valve on the hot water tank is well known for failing after a drain down.
Click to expand...
The elbow valve you mentioned, is that the push fit elbow with the pressure relief valve built into it? I wondered if it was worth carrying a spare one of these.
Ps sorry for butting into post OP.
 
His problem does not seem to be air in the system. he says that the taps run as normal when open. His problem is that the pump keeps running when the taps are closed. he says the pump runs at a slower speed --- but it would when all the taps are closed and it is building up pressure in the system.

PS: Does anyone know what he means by 'the bowl filter'?
 
AlyJay said:
The elbow valve you mentioned, is that the push fit elbow with the pressure relief valve built into it? I wondered if it was worth carrying a spare one of these.
Ps sorry for butting into post OP.
Click to expand...
It is the outlet elbow at the top of the boiler with a narrower vent tube attached. Truma describe it as an aeration valve and vent not as a pressure relief valve. It is there to allow the boiler to empty properly when draining down. It sometimes leaks a bit of water out or air in. Manual extract.IMG_0705.jpeg
 
Vanterrier said:
I assume the "bowl filter" is the wee in line filter normally just before the pump inlet ( catches any crud from the tank) its normally a clear plastic jobbie and can leak... water out, or air in.
It can also crack if not completely emptied in winter...

K ;)
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So it is not a submersible pump then. That narrows things down a bit.

The OP as not been back to the forum, so we will just have to guess the setup.
 
The problem is rectified. To explain, there was a small leak on the inline filter on the inlet side of the pump. This allowed air to be entrained into the pump. As it always had air in the pump body it was not able to reach cut off pressure as there was always air in the system.
 
Okta said:
It is the outlet elbow at the top of the boiler with a narrower vent tube attached. Truma describe it as an aeration valve and vent not as a pressure relief valve. It is there to allow the boiler to empty properly when draining down. It sometimes leaks a bit of water out or air in. Manual extract.View attachment 76452
Click to expand...
Thanks Otka 👍.
 
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