Pressure issues Ideal Logic Combi 30

[Darcher88]

Hi, we have an ideal Logic combi 30 and have an issue with the system loosing pressure. We have had an engineer look at the system twice without being able to find a fault.

I isolated the boiler last week to determine it was the boiler and not the rest of the system.

When the system was warm the pressure dropped from 1 bar down to 0.6 within 40 seconds. The system then stabalised.

I then pressurised the system to 1 bar and did the same with the system cold. No initial drop - after 3 hours it was at 0.4 bar.

The engineers pointed to the heating engine or the Expasion vessel, however the pressure seems to be consistent in the expansion vessel.

Any ideas?

Thanks

 

[Scott_D]

Any water outside from the pressure release pipe?
Have you checked all rad valves?
Did the boiler loose pressure when isolated at the valves underneath?

 

[Traditionalplumber]

Hi, we have an ideal Logic combi 30 and have an issue with the system loosing pressure. We have had an engineer look at the system twice without being able to find a fault.

I isolated the boiler last week to determine it was the boiler and not the rest of the system.

When the system was warm the pressure dropped from 1 bar down to 0.6 within 40 seconds. The system then stabalised.

I then pressurised the system to 1 bar and did the same with the system cold. No initial drop - after 3 hours it was at 0.4 bar.

The engineers pointed to the heating engine or the Expasion vessel, however the pressure seems to be consistent in the expansion vessel.

Any ideas?

Thanks

Put a balloon on the pressure relief pipe outside or a little container underneath. This will tell you if your prv is letting by or not.
Always best to check the expansion vessel aswell. So the correct way to do this is with an empty boiler (0.0 bar of pressure) look for the expansion vessel you’ll find a a schrader valve on it like a car or bicycle tire. Using a decent pump check the pressure it should be about 0.75 bar. If it isn’t pump it up.

Without the correct pressure in the expansion vessel your heating could expand too rapidly and cause your prv to open and let water out when the pressure shoots up.
If it turn out to be the prv letting by then , with a cold system you could try giving a loving tap on it. Sometimes they can lift and warp. If it still not solved call a gas safe engineer and explain what has happened and they will change the prv for you!

Give it a go, but be safe.

 

[Darcher88]

Any water outside from the pressure release pipe?
Have you checked all rad valves?
Did the boiler loose pressure when isolated at the valves underneath?

Evening! Cheers for the reply.

The engineer said the pressure release pipe was bone dry. I've checked all the rad valves too.

Yes the boiler lost pressure when I isolated it with the valves underneath. After the boiler had been on and the boiler was warm the pressure dropped from 1bar down to 0.6bar rapidly.

When it was cold there wasn't an initial drop. However 3 hours later it had dropped to 0.4bar.

 

[Darcher88]

Put a balloon on the pressure relief pipe outside or a little container underneath. This will tell you if your prv is letting by or not.
Always best to check the expansion vessel aswell. So the correct way to do this is with an empty boiler (0.0 bar of pressure) look for the expansion vessel you’ll find a a schrader valve on it like a car or bicycle tire. Using a decent pump check the pressure it should be about 0.75 bar. If it isn’t pump it up.

Without the correct pressure in the expansion vessel your heating could expand too rapidly and cause your prv to open and let water out when the pressure shoots up.
If it turn out to be the prv letting by then , with a cold system you could try giving a loving tap on it. Sometimes they can lift and warp. If it still not solved call a Registered Gas Engineer and explain what has happened and they will change the prv for you!

Give it a go, but be safe.

Cheers for the reply! I'll give this a go as the engineer who looked at the system had said he had done this before i got home from work.

They had repressureised the expansion on the first visit and the second engineer checked this as well. Ill do as you have said and check the pressure to see if it has dropped since they were here.

Thanks again!!

 

[EvilDrPorkChop]

Heat exchanger - common issue on these boilers. I'm guessing 6/7 years old?

Get a pin ***** on the inside of the Hex and leaks back down condensate drain.

 

[Scott_D]

Heat exchanger - common issue on these boilers. I'm guessing 6/7 years old?

Get a pin ***** on the inside of the Hex and leaks back down condensate drain.

Agreed
Really easy to check on the logic aswell.

 

[Stu-B]

Heat exchanger - common issue on these boilers. I'm guessing 6/7 years old?

Get a pin ***** on the inside of the Hex and leaks back down condensate drain.

Yeah seen a few of the older logics do this

 

[Darcher88]

Heat exchanger - common issue on these boilers. I'm guessing 6/7 years old?

Get a pin ***** on the inside of the Hex and leaks back down condensate drain.

Yer the last engineer said it could be that. Yep, just over 6 years old! He was looking at the condensate drain but couldn't see much there though....Said it was dry.

 

[Darcher88]

Agreed
Really easy to check on the logic aswell.

The condensate trap is right in front of you in the middle isnt it? If I disconnect the pipe and put something else in place to catch the water that should be OK to check shouldn't it?

 

[Scott_D]

I’m not trying to be unhelpful but you shouldn’t be taking the case off the boiler.
Maybe try a find someone in your area familiar with logics.

 

[Darcher88]

I’m not trying to be unhelpful but you shouldn’t be taking the case off the boiler.
Maybe try a find someone in your area familiar with logics.

Yer I know what you mean. But I've spent £200 for engineers to not find a root cause. Kind of stuck with what to do

 

[ShaunCorbs]

£200 for what two visits ? If so get them back out as tbh if they have just isolated the boiler and left to on test then come back you’ve been done

ideal offer a fixed price repair around the £300 mark will fix anything wrong with the boiler

 

[Darcher88]

£200 for what two visits ? If so get them back out as tbh if they have just isolated the boiler and left to on test then come back you’ve been done

ideal offer a fixed price repair around the £300 mark will fix anything wrong with the boiler

The £200 was including a service but still takes the p##s. Thanks for that, I'll have a look.

 

[freeoil]

The £200 was including a service but still takes the p##s. Thanks for that, I'll have a look.

Would you like the engineers to work for free?
If so explain on the phone before the guys come out....good luck with that lol.