If your Vaillant ecoTEC Plus boiler fires up, the temperature climbs slowly to around 37°C, and then the boiler suddenly cuts out without showing any fault code, you’re not alone.This issue is far more common than most homeowners realise — and even some engineers can misdiagnose it at first. At Certificates4UK Ltd, we repair Vaillant … Continue reading Vaillant Boiler Cutting Out at 37°C With No Fault Code? Here’s the Real Cause