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home Fix label Heating label_important Home Heating Systems category Vaillant

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
home Fix label Heating label_important Home Heating Systems category Vaillantdone
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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