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Posted on Jan 02, 2017
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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