vaillant eco tec pro 28 my boiler is showing fault f.28 and will not ingite please help IF the weather is extremely cold, and you're getting F28, the external pipework may be blocked with ice. Warm up
vaillant eco tec pro shut down last night showing fault f.28 and will not ignite today 08/01/2010 looked out side to see the condenser pipe was frozen i defrosted the pipe but boiler still wont ignite
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