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    Vaillant EcoTec Plus combi issue - VL-RL Spread too big

    Hi All, I am experiencing a simple problem after trying to re-start my Vaillant combi boiler after draining the system. The problem only occurs with the hot water demand and it appears to relate to a VL-RL Spread (error S.53). What is VL-RL spread and how can I ensure sufficient water flow in...
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