i have just fitted vessman 100-35kw.could any one help me out.the pressure from the heating system drops to zero,when switch off.have checked for any leeks.no leeks found.have flushed the system.
If you have fitted a gas appliance, e.g. a boiler, then you should be gas registered and are expected to have learned all about heating installations during your training!
Would you like to explain exactly what the situation really is?
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