DIY Doctor

Combi hot water problem

Postby andymor » Mon Apr 20, 2009 11:30 am

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?

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Simply Build It

Postby uk_ducati » Wed Apr 22, 2009 8:55 pm


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

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Postby Steve the gas » Thu Apr 23, 2009 4:42 am

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

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Postby pete the heat » Thu Apr 30, 2009 11:42 am

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
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