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Thread: combi boiler problem ??

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    Question combi boiler problem ??

    any heating engineers about ??
    the combi boiler my GF has is running way too much pressure and the usual trick of bleeding off from a rad isnt working , does the water need topping up ?? it works as it should and all the rads are hot !
    any ideas or thoughts welcome folks

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    Regular Member beat275's Avatar
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    Vehicle : Hatch

    Trim : SRI

    Engine : 2.0T

    Year : 2003

    Mileage : 90000

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    The pressure should read 1 and a half bar so bleed it till it reads that. There the pressure relief valve in the boiler should be a red knob

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    Regular Member lee gsi's Avatar
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    When are you reading the gauge as it will read higher if the hot water is running or the heating is on.

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    Regular Member beat275's Avatar
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    Vehicle : Hatch

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    Good point forgot to mention that.

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    Depending on the pressure it reaches, could be a faulty expansion vessel or leaking heat exchanger.

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    i'm familiar with normal running , it normly needs the pressure boosting via the valve at the bottom and on occasion i've bled the rads a bit to release pressure , but the pressure only drops if i turn it down to " on the water temp setting
    thanks thus far folks

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    Quote Originally Posted by beat275 View Post
    The pressure should read 1 and a half bar so bleed it till it reads that. There the pressure relief valve in the boiler should be a red knob
    does it relieve through the over flow when this valve is used ??

  8. #8
    Regular Member Ben50n's Avatar
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    Is the boiler filler valve actually open and constantly feeding the boiler??

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    Regular Member gtr1000's Avatar
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    Trim : Sri

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    Quote Originally Posted by Ben50n View Post
    Is the boiler filler valve actually open and constantly feeding the boiler??
    Good point . Flexible hose (aka "fill loop") should always be disconnected to prevent backflow and accidental overfilling. If they're ball type isolating valves on the fill loop (there's usually two, one each end of the hose), these have a tendency over time to either 1) not isolate properly or 2) leak from the ball part of the valve.

    I'd tend to disconnect the fill loop and relieve the pressure to around 1.5bar when the system's cold.

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    will check all these after work and report back

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