Hoping someone can point me in the right direction --- Vaillant 282 Turbomax.
System cold, boiler fires up fine and works fine in every respect. Once warmed through (say 20 - 30 minute use), whether looking for water or heating, it will fire, with a minimal flame, doesn't increase the flame size then trips out, leaving the flame fail lamp on. Bypassing the lockout while it's hot produces the same sequence.
The fault charts dont precisely cover this. For reference, both circuit boards are new (same symptom with new or old boards) and a complete new gas valve assembly (operator, solenoid etc.) Am now pondering NTC sensor or air switch --- any thoughts most welcome.
Mike.
System cold, boiler fires up fine and works fine in every respect. Once warmed through (say 20 - 30 minute use), whether looking for water or heating, it will fire, with a minimal flame, doesn't increase the flame size then trips out, leaving the flame fail lamp on. Bypassing the lockout while it's hot produces the same sequence.
The fault charts dont precisely cover this. For reference, both circuit boards are new (same symptom with new or old boards) and a complete new gas valve assembly (operator, solenoid etc.) Am now pondering NTC sensor or air switch --- any thoughts most welcome.
Mike.