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F9 Glow-worm Flexicom SX?

Evening,
Can anyone help?
Everytime I want our heating to come on I have to go to the boiler to find it flashing Fault 9.
I have to reset it and open the taps until it fires up.
If I turn the thermostat down so it goes off and then want the heating on later, i turn the thermostat back up and agin it won't automatically come on and I have to again open up the taps, does anyone know what the fault might be?
We have tried everything.
Hope someone can help!
Many Thanks
Dawne, October 2010
water pressure fault

b, October 2010
link Click here to see other fixes for Glow-Worm.