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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
VaillantVaillant ecoTECHeating, Home Heating SystemsVaillant Heating Boiler
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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