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Viessmann Vitodens 100-W boiler keeps switching off

youre using sunvic controls thats your 1st problem, cheap crap.

Well thats helpful? They have worked fine for 11 years without a problem and as yet no one has said the thermostat is at fault. The boiler has only been in for 9 months

If there is a chance its the thermostat how do I test it?
 
id get a better stat, the boilers are very good they are my 1st choice, you would have to let us know what stat you have 1st
 
The stat is the Sunvic TLX, is there anyway to test it or do I just have to buy and fit a new one?
 
youll need a multimeter with a continuity tester ie buzzer and make sure you get a buzz when it turns off and on over the right terminals
 
Hmm I dont have a tester, dont know how to proceed now then
Thanks anyway
 
New thermostat you mean? are they all universal or would it have to be another Sunvic? which is the best one to get

Thanks
 
id get the similar honeywell one, should be similar wiring, depends how confident you are, if worried just get the straight replacement
 

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