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P1 is the Boiler running at Max and he has tested the pressure at the valve. Shaun is right with the drop on a Vaillant in that the pressure will be higher at the appliance inlet than at the valve test nipple. Your Boiler will be three this year and I can't remember when the manual was altered but if you have the one left by the installer and it says 13 mb min, then ask them to come back.
 
The boiler also has not been cleaned as it should be done annually. He did not open the burner and cleaned and checked the electrodes. I would also say that the gas rate seems dodgy to me meaning I don’t believe he has ever done it. However, I would call them back
 
The boiler also has not been cleaned as it should be done annually. He did not open the burner and cleaned and checked the electrodes. I would also say that the gas rate seems dodgy to me meaning I don’t believe he has ever done it. However, I would call them back
It’s not required every year
 
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