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  1. M

    Vaillant 831 Intermittently does not reach set flow temp

    Several times in a week, system flow water temp settles at mid 50s (return: high 40s) when the set flow temp is 75. Room stats calling for heat, burner on, pump on, pressure OK, no new codes. Just doesn't rise to the set flow temp. This continues until boiler is switched off, cools down (to mid...
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