i have a Potterton Powermax boiler its 5 yrs old and it is constntly going on to lockout. the LED says it is under preasured , i keep topping it up with the small black taps at the bottom but it still keeps going on to lockout every 5-10 mins , Im sure this is a common fault can anyone help me please !!.

Nick., February 2009

if your lockout it should show a error code,if its showing A15.you my have a leak check your Discharge pipe out side for water dripping if water is present checkyour TPR valve there is a tundish below it check for water if water is present you my have a problem with the relief valve.if you could tell me wat your erro code is i would have a better understanding wats going on

mjm fix it, March 2011