K
KMaxx
Greetings o ye boiler experts… 
Worcester Bosch 35CDi II Combi boiler, possibly about 7 years old (we moved in only Aug 2014)
>> Default pressure on the boiler gauge when cold was 0.3 Bar.. (Has never dropped to 0)
>> Everything works though– Central heating, hot water
--- (though there are oscillating temperatures fluctuations in all hot water taps - kitchen and shower from rising till its too hot, luke warm and back again, even though the tap is maintained in the same position – will park this issue for now).
>> When running the system with Central Heating (CH) on, the pressure eventually rises to about 1.6 Bar. Upon cooling down, its back to 0.3 bar.
>> Re-pressurize the system yesterday following the instructions, which rises oh-so-very slowly.
>> Stopped the re-pressurization upon reaching 1.2 Bar (which took a good 10 minutes or so) – however, the pressure STILL climbed very gradually thereafter on its own settling at about 1.8 Bar.
---------- The first night, keeping CH OFF, and only using the water for showers, cooking, the pressure rise is insignificant, returning to about 1.8 Bar when cold.
--------- This evening, with pressure at 1.8 Bar when cold, I turned the CH on.. and the pressure rose to 3.1 Bar in about 15 minutes or so– at which point I panicked and turned CH off, and the pressure eventually has dropped to about 1.8 Bar.
Thus – The pressure difference on the boiler with CH not-running and running is ALWAYS about 1.3 Bar (irrespective of the starting low pressure, i.e 0.3 or 1.8) --- Is this quite abnormal?
Don’t seem to notice any leaks at the radiators. A few are ON and in some rooms they are OFF. They seem to be heating ok (though may be I should pay more attention for air-pockets)
Any thoughts on what I might need to have looked at? --- i.e The boiler itself, pressure from the water mains, varying the gauge on the boiler for CH/hot water, or look at the pipework?
Could it be that this boiler pressure behaviour has a knock-on effect with the oscillating hot water temperatures experienced? (or is that quite independent?)
Greatly appreciate any thoughts .. Many thanks :blush5:
Worcester Bosch 35CDi II Combi boiler, possibly about 7 years old (we moved in only Aug 2014)
>> Default pressure on the boiler gauge when cold was 0.3 Bar.. (Has never dropped to 0)
>> Everything works though– Central heating, hot water
--- (though there are oscillating temperatures fluctuations in all hot water taps - kitchen and shower from rising till its too hot, luke warm and back again, even though the tap is maintained in the same position – will park this issue for now).
>> When running the system with Central Heating (CH) on, the pressure eventually rises to about 1.6 Bar. Upon cooling down, its back to 0.3 bar.
>> Re-pressurize the system yesterday following the instructions, which rises oh-so-very slowly.
>> Stopped the re-pressurization upon reaching 1.2 Bar (which took a good 10 minutes or so) – however, the pressure STILL climbed very gradually thereafter on its own settling at about 1.8 Bar.
---------- The first night, keeping CH OFF, and only using the water for showers, cooking, the pressure rise is insignificant, returning to about 1.8 Bar when cold.
--------- This evening, with pressure at 1.8 Bar when cold, I turned the CH on.. and the pressure rose to 3.1 Bar in about 15 minutes or so– at which point I panicked and turned CH off, and the pressure eventually has dropped to about 1.8 Bar.
Thus – The pressure difference on the boiler with CH not-running and running is ALWAYS about 1.3 Bar (irrespective of the starting low pressure, i.e 0.3 or 1.8) --- Is this quite abnormal?
Don’t seem to notice any leaks at the radiators. A few are ON and in some rooms they are OFF. They seem to be heating ok (though may be I should pay more attention for air-pockets)
Any thoughts on what I might need to have looked at? --- i.e The boiler itself, pressure from the water mains, varying the gauge on the boiler for CH/hot water, or look at the pipework?
Could it be that this boiler pressure behaviour has a knock-on effect with the oscillating hot water temperatures experienced? (or is that quite independent?)
Greatly appreciate any thoughts .. Many thanks :blush5:
