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code 4 fault on my glow worm 30sx boiler?

i have had a code 4 fault on my boiler. it stopped working as the pressure had to be topped up. i did this and now it is at 1 bar but there is now this code come up. please help as glow worm wont come out for 5 days.

tony b
December 2010
Heating, Home Heating SystemsGlow Boiler Pressure

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