Rads need constant bleeding

[MaksimsK]

Hi.
After the boiler swap in mid december (Ideal logic Max combi c30), we started having this problem with rads.
Usual symptoms: colder top rad, I can hear water flowing in pipes and rads. Usually need bleeding every 1-2 weeks since then. Pressure was on same level even after bleeding, but not today. After rad bleed, pressure has gone to 0.

Guy who installed this boiler dodging to come and solve the problem, he says that the boiler works fine, he is not trading anymore (but its just the reason not to come and solve that problem)

So his thoughts was:

• residual air from install
• air sucked from rad connection
• lock shields restricting the flow causing turbulence ( water flowing sound in rads)
• erp pump create vortex down the pump

I can fit Spirovent or self bleeding valves, but its not solving the root problem.

Any thoughts?

 

[EvilDrPorkChop]

What was your installation before, did you have a combi boiler or a traditional system with tanks in the loft?

 

[MaksimsK]

iler or a traditional syste

What was your installation before, did you have a combi boiler or a traditional system with tanks in the loft?

just boiler swap from Ariston combi 38 to Ideal logic Max combi c30

 

[EvilDrPorkChop]

Did the old boiler hold pressure OK? Has it only since you've had the new one fitted you've got the pressure issues?

 

[MaksimsK]

Did the old boiler hold pressure OK? Has it only since you've had the new one fitted you've got the pressure issues?

the old boiler has no problem with pressure as far as I know. we bought this house in November 1st, but in mid-december, pump died to sludge and PCB as well. so it was like for like change

 

[EvilDrPorkChop]

Well you've got a leak on the system somewhere. Without knowing what it was like over a longer period of time on the old boiler it's hard to say whether it's part of the new boiler installation or a leak on the existing system.

Have you been round and felt all the joints on the radiators, top and bottom to see if you can find anything? If you are only loosing pressure ever week the leak isn't going to be major.

 

[Stigster]

Sealed systems with air ingress often happens on the vacuum side of the circulating pump. It's well worth giving both pump valve nuts a bit of a tighten and see how you go after that.

 

[moonlight]

Do you have a faulty pressure relief valve?

 

[MaksimsK]

Well you've got a leak on the system somewhere. Without knowing what it was like over a longer period of time on the old boiler it's hard to say whether it's part of the new boiler installation or a leak on the existing system.

Have you been round and felt all the joints on the radiators, top and bottom to see if you can find anything? If you are only loosing pressure ever week the leak isn't going to be major.

its not losing pressure, the system is filled with ar after a week or so. But only towel rail, master bedroom rad, ad one of the kitchen rads.
All floorboard are lifted, no leaks at all.
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Do you have a faulty pressure relief valve?

pressure stable on 1.2, on full heat up to 1.8-2. no leaks on prv pipe

 

[moonlight]

the old boiler has no problem with pressure as far as I know. we bought this house in November 1st, but in mid-december, pump died to sludge and PCB as well. so it was like for like change

If the heating was sealed before why sludge?
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Have you checked the filling loop is not letting by? on the new install.