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Ferroli Optima 901 Pressure Problem - Help Please !!!

Discussion in 'Plumbing and Central Heating' started by johnnywishbone1, 11 Jan 2009.

  1. johnnywishbone1

    johnnywishbone1

    Joined:
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    Hi,

    I have a problem with my Combi boiler whereby the pressure rises to about 3 bar when the central heating has warmed up but if I switch off, the pressure drops to Zero!!! If I leave the heating on it works perfectly although the pressure is high obviously. When the pressure drops I have to refill using the filling loop. I top up to just over 1 bar but again, when the heating kicks in and warms up it rises to 3 bar. Any help would be greatly appreciated.

    Cheers ;)
     
  2. hect

    hect

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    Possibly exp vessel - is your PRV passing?
     
  3. jackthom

    jackthom

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  4. johnnywishbone1

    johnnywishbone1

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    Thanks gents, I'll give it a go this weekend ;)
     
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  6. johnnywishbone1

    johnnywishbone1

    Joined:
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    Right then, so I have just changed the expansion vessel after draining down the system as per the FAQ instructions. I didn't actually have any water coming out of the schrader valve of the original which would indicate a defect but I decided to change the tank anyway as I already had the spare one ready to go. It was £42 from plumb centre so not the end of the world. After refilling the system and bleeding all the rads I noticed something strange. On the bottom cover I saw dry green gunk !!! When I looked above it I could see it had been coming from the automatic air vent attached to the air seperator. It's a knurled thumb screw which is quite difficult to get at. Firstly I tightened it down but then no air could escape when the central heating was running and so I opened a little and could hear air escaping and could see air bubbling through the green stuff for about 30 seconds and then stop. I assume this is to relieve the system of trapped air ? Any ideas anyone ?? ;)

    Also, any ideas how best to replace the inhibitor in the central heating ?

    Cheers.
     
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