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Pressure too low on Vaillant Turbo Max 242E?

When I turn on the hot water tap the ignition doesn't always light up. I've been told the pressure is too low as it is below 1 but I don't know how to get the pressure up.

Any help would be greatly received.
Jane, October 2007
these will run as low as 0.5 bar pressure. whne u turn hot tap on green light should start 2 flash if not then aquasensor has failed. if it does then diverter valve is jammed in htg position. email DPMARTIN17@AOL.COM

paul martin, October 2007
link Click here to see other fixes for Vaillant.