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Mend Vaillant ecotec plus 831 Ecotec Plus Boiler

Heating not working ?

I have a Valliant ecotec plus 831 I have hot water, I have tried to put it in heating mode for the heating to come on isn't working, clicked on information and it tells me no heat demand summer operating mode but I have switched it into heating mode.
I have done a chimney sweep and the heating come on but once this has finished it switches off
Any ideas

Melissa
October 2016
VaillantVaillant ecotec plus 831Heating, Home Heating SystemsVaillant Ecotec Plus 831 Boiler

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Vaillant Ecotec 831 Heating Issues - Help!