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Had the same container light problem. Found the secret flap under the condenser and cleaned out the sump but the problem persisted. Solved the problem in the end by cleaning the metal prongs that extend into the sump. These has become gunked up with sludge and we’re making an electrical...

My vaillant ecotec plus 937 only delivers about 2 minutes of hot water before it runs cold. Domestic & General sent their plumber out who said it was sludge in the domestic hot water heat exchanger (blockages not covered under the policy so couldn't fix it). I had the system flushed and...