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Mend Vaillant ecotec plus 837 Water Heating Working

How can I fix my vaillant ecotec plus 837?

Getting luke warm water, and heating has stopped working. checked panel, I have a flashing radiator sign. When I pressed i, the code is S.8.

Can anyone help?

Kadeem
April 2010
VaillantVaillant ecotec plus 837Heating, Home Heating SystemsVaillant Water Heating Working
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