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Honeywell st499a/st699b central heating microelectronic time controller. it's got 2 switches 1 for heating and 1 for hot water. when i turn on hot water only heating works as well and vice versa. how can i sort that out. tried calling honeywell who are useless and have nobody on the phone. thanks aleks

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  • Anonymous Oct 19, 2008

    I HAVE A IMI ROLYAT ORBITT TYPE RR4 PRIMARY 115 LITRE TANK WITH SECONDARY 135 LITRE LINK TO A HONETWELL ST499 A CENTRAL HEATING CONTROLLER



    HOW DOES IT WORK?



    ALGY

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SOURCE: I have a Honeywell ST499A/ST699B

I have an old Honeywell ST499A/ST699B thermostat. It still works OK but when we have a power cut I have to re-programme everything. Presumably this is because the battery needs replacing. I cannot find a way of opening the control box to get into the unit to replace the battery and in any case I’m not sure if the battery is renewable?

Posted on Dec 28, 2009

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