Alde heating
We have a Alde 3010 wet heater, the water works fine but have no heat on the Rads, the temp is set to 30c but will not circulate the pie out of the boiler and in to it are getting warm.up to about a foot on either side and the rest are cold. i have opened the valves to check for air locks but still not working after a few minutes the boiler cut out as the fluid in it has reached temperature the circulation pump in the header tank is still running but fluid not circulate and warming the rest of the van. can one had the same problem.
Comments
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As you say the pump is spinning and locally at the boiler the water is heated, I can think of no other situation other than there is an airlock [here I am assuming there is fluid in the header].
I know you have opened the bleeders, but have you found all of them?
The best way forward is to bring in a caravan mechanic with the Alde purge pump. Should your fluid be anywhere near its end of life have them change to a G13, a 5 year fluid at that time, to off-set the overall costs involved. Relative, to sorting the problem today and need him back next year to change the fluid.
If you live anywhere close to Wellingborough get an appointment to take the van there; second to none company to deal with. Their # 01933 677765
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I agree with ocsid! Air locks! the bleed valves are all over the place in my caravan, behind seats, in the cupboards by the wheel arch, washroom radiator. Miss one and no flow.
Also, I have had most air lock problems after a fluid change so I am not too convinced by the Alde purge pumps.
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"Also, I have had most air lock problems after a fluid change so I am not too convinced by the Alde purge pumps".
To an extent I agree, in that post a fluid change or initial fill, you can a bit down the line be troubled by new air locks forming, if it is not done thoroughly. IMO from air trapped up the bleeder risers expanding when first getting really hot and dissolved air coming out and causing a "new" airlock to form.
The purge pump is very effective in getting the fluid to a state the circulating pump can operate, but, then that is not the end of the job and IMO this is the assumption some dealers/service people make.
The system then needs to run for a while getting very hot, and then all the bleeders need any trapped air in them released. After this the system should be air lock free till the next fluid change comes along.
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It really does appear to be an air lock issue in my limited opinion. Finding all the bleed valves and venting these in sequence (lowest to highest) is crucial. I found that parking my van on a significant incline and then venting helped. It took a few attempts but eventually the problem was solved and much quieter to boot.
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"We are assuming that it is an airlock problem."
Quite rightly IMO as that and only that fits the facts given us.
"The op also need to confirm that the pump is working. I suppose it might be spinning but not pumping."
With a centrifugal pump's rotor spinning within fluid as has been stated, then the physics will ensure it creates a depression at its inlet eye, it can't do anything else.
If we mean by "pumping", it is not moving the fluid onward, ie "sucking" it up the riser here, then that can only be because the fluid will not move. It is as said, creating the depression that would move fluid free to be moved.
And, unless we consider other blockages than those caused by one or more "lifts" uphill of the fluid within the system due to airlocks, it beats me what else might possibly do that.
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When I had the problem on site about 7 years ago with a newish caravan that had the pump in the header tank the solution was easy in my case.
Obtained correct antifreeze and diluted to spec. Lowered caravan right down at front, turned off pump and simply bled the bathroom radiator. I did not need to faff with other bleed points. Maybe I was lucky
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