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Post by rocketmanbkk on Mar 16, 2022 7:37:47 GMT
Hello
A sealed ch system is constantly losing pressure.
Heat only boiler. New expansion vessel fitted, no leaks can be found, floors have been taken up, everything is bone dry.
Pressure is dropping each week.
Any ideas?
Cheers all
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Post by battle1066 on Mar 16, 2022 17:04:26 GMT
Hello A sealed ch system is constantly losing pressure. Heat only boiler. New expansion vessel fitted, no leaks can be found, floors have been taken up, everything is bone dry. Pressure is dropping each week. Any ideas? Cheers all New heat exchanger would be my bet. |
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Post by endfeed on Mar 16, 2022 18:40:01 GMT
Is the p.r.v passing?
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Post by crowsfoot on Mar 16, 2022 18:55:00 GMT
Can you isolate the boiler rocky from the heating circuit?
If you can, do it and then re-pressure (just the boiler) it then leave it for say 24hrs - if it then still loses pressure then it's most likely as battle states the heat exchanger (with the pressure loss due to the H/Ex leaking into the condense pipe).
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Post by rocketmanbkk on Mar 17, 2022 12:44:30 GMT
Can you isolate the boiler rocky from the heating circuit? If you can, do it and then re-pressure (just the boiler) it then leave it for say 24hrs - if it then still loses pressure then it's most likely as battle states the heat exchanger (with the pressure loss due to the H/Ex leaking into the condense pipe). Ok. I can try that. The boiler is only 2 years old. I’ll isolate & see what happens I’ll report back |
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Post by dickpuller on Mar 18, 2022 6:22:47 GMT
Have you tried my ‘Whore’s Handbag’ tip dear boy??!!!
or Sandwich Bag over the Blow Off??!!!
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Post by crowsfoot on Mar 18, 2022 20:30:00 GMT
Can you isolate the boiler rocky from the heating circuit? If you can, do it and then re-pressure (just the boiler) it then leave it for say 24hrs - if it then still loses pressure then it's most likely as battle states the heat exchanger (with the pressure loss due to the H/Ex leaking into the condense pipe). Ok. I can try that. The boiler is only 2 years old. I’ll isolate & see what happens I’ll report back At only 2 years old it seems a bit new to have leaking hex problem! Still, that losing pressure must have a cause and if you can isolate boiler/system you should be able to narrow down where the problem lies. |
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Post by dickpuller on Mar 19, 2022 6:21:36 GMT
What Boiler is it Rocky? I know there’s been issues with the Ideal Logics & leaking Heat Exchangers.
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Post by rocketmanbkk on Mar 19, 2022 11:56:16 GMT
What Boiler is it Rocky? I know there’s been issues with the Ideal Logics & leaking Heat Exchangers. It’s a WB heat only. |
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Post by battle1066 on Mar 20, 2022 10:57:58 GMT
I’ve found if i can’t visibly find the leak its been the exchanger and its an item which fails at anytime.
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Post by rocketmanbkk on Mar 20, 2022 13:17:27 GMT
Here’s an update
Since I topped up the pressure last week the customer hasn’t used the heating.
The boiler continues to heat the hot water cylinder. No problems there.
The chap got is the loft & the pressure has held, no drop whatsoever.
So it seems there is no leaks on the heating pipework but a pressure drop if the heating is used a lot.
Something, somewhere must be drawing in air.
Perplexing
But at least the pressure has held.
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Post by battle1066 on Mar 20, 2022 16:58:52 GMT
Here’s an update Since I topped up the pressure last week the customer hasn’t used the heating. The boiler continues to heat the hot water cylinder. No problems there. The chap got is the loft & the pressure has held, no drop whatsoever. So it seems there is no leaks on the heating pipework but a pressure drop if the heating is used a lot. Something, somewhere must be drawing in air. Perplexing But at least the pressure has held. That summary implies the expansion vessel is defective either low on pressure / faulty or possibly just too small for the system size. |
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Post by rocketmanbkk on Mar 20, 2022 17:32:39 GMT
Here’s an update Since I topped up the pressure last week the customer hasn’t used the heating. The boiler continues to heat the hot water cylinder. No problems there. The chap got is the loft & the pressure has held, no drop whatsoever. So it seems there is no leaks on the heating pipework but a pressure drop if the heating is used a lot. Something, somewhere must be drawing in air. Perplexing But at least the pressure has held. That summary implies the expansion vessel is defective either low on pressure / faulty or possibly just too small for the system size. It’s a new (3 months old) 25l vessel. Should be big enough. It’s not letting by as I’ve checked it. |
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Post by crowsfoot on Mar 23, 2022 8:07:51 GMT
Could it just be that the air valve on the expansion vessel is faulty?
Try and tighten the cap on it as much as possible (as a temporary measure it sometimes works).
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