Could it be the Pump or the Diverter Valve?

7 Dec 2020
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United Kingdom
Hi guys,

We have a Vaillant Ecotec 831 Plus

...So for the last couple of days our downstairs rads are not getting warm, upstairs were ok. we have a Combi system with Megaflo tank, we have the hot water schedule set so that it heats the water for 2 hours in the morning and 2 hours in the evening.

So this morning, I moved the hot water schedule, so that it's not heating the water as the time as the Central Heating is on.

As soon as I done that the Radiators downstairs started to warm up.

So what does this mean please?

Do I have a dodgy Diverter Valve or is my Pump weak?

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