DIY Doctor UK DIY Forums

I have a Ferroli Optima 1001 which over the last couple of weeks has only
supplied hot water intermittently, some times you can run the hot tap for
ages & only get cold water, other times hot water is okay or yet again you
get hot water for a few seconds & then it reverts to cold again. Anyone had
the problem & is there a fix?

Cheers.

hi

only guessing but it sounds like you have a problem with a temperature sensor. A job for an engineer unless you are ok with a multimeter

paul

Could be a few things but maybe the diverter is the starting point- may be 'sticking'

Hth

first off the optima does not have a diverter,check resistance across hw thermister and hw potentiometer if this information seems too technical please call a combi expert.a quick rough test is to swap wiring from ch thermister to hw thermister and run hot tap,if this works bingo change hw thermister.(thermister identification):-12mm chrome nut with green top and connector note they are wet pocket ie if removed with water on YOU WILL GET WET