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Immersion heater - economy 7 timer wiring

Former Community Member
Former Community Member
Hello,


I have a honeywell st6400c controller and an immersion heater. 

My heater has 2 switches, off and on peak. My concern is that the heating works only with both switches on. Even if its set to trigger at off peak time only, which it does, both switches light up and if I switch off the onpeak one, the heating stops even tho the offpeak is still lit (testing this at off peak hours ofc). Is this correct ? does this not use much more electricity? I was monitoring this and Im sure it goes against the "night" hours, but my worry is that it uses much more power than it should.

Thank you for your advice

Tom
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  • Typiod:

    If the clock is in fact an ST6400c then it only has 3 amp switching contacts.




    I had not spotted that it is not even an immersion heater timer, throw it away as if it has been run controlling an immersion heater as it is scrap.


    If it is not actually controlling the immersion heater and is in fact controlling a central heating boiler it could be a gravity system and the heating won't run without the hot water.


    Andy B.


Reply
  • Typiod:

    If the clock is in fact an ST6400c then it only has 3 amp switching contacts.




    I had not spotted that it is not even an immersion heater timer, throw it away as if it has been run controlling an immersion heater as it is scrap.


    If it is not actually controlling the immersion heater and is in fact controlling a central heating boiler it could be a gravity system and the heating won't run without the hot water.


    Andy B.


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