Hot water coming from expansion pipe into header tank.

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As Subject, have read other posts.
Running pump at slowest, faster gives more flow out of expansion pipe.
Boiler goes on and off so I assume its thermostat working.
Bleed radiators and pump.
Lowered level water in header tank when cold so when water comes from expansion pipe no water overflows.
Hot water from taps ok.
All radiators hot, so no blockages.

Is it bad to have this water coming out of expansion pipe?
 
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Yes, it will cause corrosion / sludge issue in the system. How is the feed and expansion connected to pipework?

Daniel.
 
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22mm copper pipe going up and past header tank and looping down so hot water falls into tank then from bottom of tank 15mm copper pipe to about 2" away from where the other left the system.

Is the corrosion/sludge caused then by the hot water passing through the air?
 
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22mm copper pipe going up and past header tank and looping down so hot water falls into tank then from bottom of tank 15mm copper pipe to about 2" away from where the other left the system.

No, the other side, eg, where do the expansion pipe connected to? Where do the feed pipe go to?
 
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Done a photo for you Stardanny.
from left Pump, Bypass, Hot water Coil, Input from header tank and Expansion pipe to header tank.
 

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Air separater is the problem, probably be full of sludge with near blocked inside tube. Heated water goes to right side of air separater and because the left side is full of sludge or near blocked, heated water goes up via the vent pipe 22mm and come back via feed pipe 15mm back onto pipe after left pipe.

Air separater need to be replaced or clean out.

Daniel.
 
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image.jpeg

This is the air separater. If you have a magnet, put it on the tube and see if it stick. If yes, near blocked

Daniel.
 
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Nothing attracting a magnet.
Replacing might be a bodging type of exercise, its a solid brazed unit from pump connection to the 3 compression pipe connectors.
Cleaning I guess worth ago.
 
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As far as I can see the separator can be removed with only a spanner.

Tony
 
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That air Sep had been cut out and unblocked before ;)
Sorry no, never been cleaned before, except for full system flushes.
Is it the compression connections that make you think that, if so not the case.
Up to those connections came with the built up cylinder c/w pump, this air separator, zone valves and appropriate pipe between.
 

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