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Mend Vaillant ecotec plus 831 Heating Not Working

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 SystemsHeating Not Working

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