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tried that and tested micro swiches and thinking may be pcb and as i have put in orignal post its strange if i unplug dhw temp sensor i get ch and flashing neon to tell me that dhw temp sensor fault

no temp control half on

iam a pipe fitter by the way lol

no lol thats like asking have i put the plug in the bath .I have installed them properly and yes it is a baxi combi instant 105e

no nothing has been done

no but i have just changed both temp sensors for new ones still the same problem pull out wire too dwh temp sensor then ch comes on

HI can anyone help me pls. i have a baxi combi instant 105e (no flashing warning lights on)the ch does not work unless i take out the dhw green wires too the heat sensor .Then the ch will come on any help will be appreseated