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can ugive me an idear on how to test using a meter i,e what to set the meter to good with a car but not with the house know how to use meter but do u set it to

got heating on all working fine as in getting all the rads hot got hot water the problem i got is that when u switch the heating off the boiler says on heating when there no demand the system is potterton flamingo 50s boiler grunfos pump (new) drayton mid pos valve (new) drayton room stat...

got trouble with my heating syterm it lights up fine and boiler kicks in but wont turn off i can turn the power off and the boiler still stay alight the systrem is potterton flamingo 50s with a 3 port valve lp522 programer grufus pump think it coud be 3 port valve but not sure and dont want to...