Boiler problems 2
Discussion
Prompted by another thread about plumbing I was hoping the PH massive might be able to help with my boiler and pressure problem
I have an Ideal Mini C24 Combi boiler (no idea if these are any good, it was here when we moved in) and have the opposite problem to the other thread, I have too much pressure. It started when we turned the heating back on about two months ago, I noticed that the pressure was a bit low so topped the system up to about 1 bar when cold with water. When the heating was on the pressure would rise to 4 bar and (off the scale sometimes) and water would come out of an overflow type pipe outside. Whenever the pressure got above 3 bar I would drain off water from the system to get the pressure down to 2.0 bar quickly. Only problem was the pressure would go back up over time (faster when the heating was on) although eventually it settled down after about a week down to 1 bar cold and 1.5 – 2 bar hot.
About three weeks ago I had to drain the system down to take a radiator off and the same problem came back only this time it’s still happening (although it is getting better). I put this down to the fact that I had added central heating treatment this time and this might take a while to “settle down” (I’m no heating expert!). I’ve bled all the rads (never any air coming out) but I’m concerned that I’ve drained off so much water over time to get the pressure down that there will be little water left in the system.
After reading the other thread it would appear my expansion vessel may need pressuring (how do you do that). Also after searching the net the heat exchanger may me broken (would this explain why the hot water isn’t as hot as it used to be)?
Apologies for the long post but anyone have any idea what is going on as it’s doing my head in!
I have an Ideal Mini C24 Combi boiler (no idea if these are any good, it was here when we moved in) and have the opposite problem to the other thread, I have too much pressure. It started when we turned the heating back on about two months ago, I noticed that the pressure was a bit low so topped the system up to about 1 bar when cold with water. When the heating was on the pressure would rise to 4 bar and (off the scale sometimes) and water would come out of an overflow type pipe outside. Whenever the pressure got above 3 bar I would drain off water from the system to get the pressure down to 2.0 bar quickly. Only problem was the pressure would go back up over time (faster when the heating was on) although eventually it settled down after about a week down to 1 bar cold and 1.5 – 2 bar hot.
About three weeks ago I had to drain the system down to take a radiator off and the same problem came back only this time it’s still happening (although it is getting better). I put this down to the fact that I had added central heating treatment this time and this might take a while to “settle down” (I’m no heating expert!). I’ve bled all the rads (never any air coming out) but I’m concerned that I’ve drained off so much water over time to get the pressure down that there will be little water left in the system.
After reading the other thread it would appear my expansion vessel may need pressuring (how do you do that). Also after searching the net the heat exchanger may me broken (would this explain why the hot water isn’t as hot as it used to be)?
Apologies for the long post but anyone have any idea what is going on as it’s doing my head in!
If the episodes of rising pressure follow you having to put more water into the system then it makes me wonder if the fill valve is leaking a bit and gradually oozing more water into the system.
In theory one is supposed to take the fill loop off after using it but nobody-obody ever ever does.
In theory one is supposed to take the fill loop off after using it but nobody-obody ever ever does.
As Pigeon says, it may be the filling loop valve leaking. They are crappy plastic things and often the plastic turns leaving the actual valve partially open.
If the vessel is f
ked, the pressure will rise alarmingly when heat is applied to the heat exchanger. This will inevitably result in water being discharged out of the safety relief which will blow at 3Bar. On cooling the pressure will drop well below te 1Bar we tend to recommend.
If the vessel is f
ked, the pressure will rise alarmingly when heat is applied to the heat exchanger. This will inevitably result in water being discharged out of the safety relief which will blow at 3Bar. On cooling the pressure will drop well below te 1Bar we tend to recommend.Pigeon said:
If the episodes of rising pressure follow you having to put more water into the system then it makes me wonder if the fill valve is leaking a bit and gradually oozing more water into the system.
In theory one is supposed to take the fill loop off after using it but nobody-obody ever ever does.
Thanks for the replyIn theory one is supposed to take the fill loop off after using it but nobody-obody ever ever does.
I haven't added any water since filling it up three weeks ago, only had to drain it off.
Ferg said:
As Pigeon says, it may be the filling loop valve leaking. They are crappy plastic things and often the plastic turns leaving the actual valve partially open.
If the vessel is fked, the pressure will rise alarmingly when heat is applied to the heat exchanger. This will inevitably result in water being discharged out of the safety relief which will blow at 3Bar. On cooling the pressure will drop well below te 1Bar we tend to recommend.
Cheers I'll disconnect the loop to check. How do I check if the vessel is gone?If the vessel is f
ked, the pressure will rise alarmingly when heat is applied to the heat exchanger. This will inevitably result in water being discharged out of the safety relief which will blow at 3Bar. On cooling the pressure will drop well below te 1Bar we tend to recommend.
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