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my vaillant boiler show f 22 what does mean?

my vaillant boiler show f 22 and there is no hot water what is the problem

erenay
May 2009
VaillantHeating, Home Heating SystemsVaillant Boiler Show F Mean
The meaning is probably Dry fire. The cause can be too little water in the appliance, water pressure sensor defective or the pump blocked or defective.

RR
May 2009

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