Question about Heating & Cooling
There is power and the heating and hot water comes on & off as well properly. however the lcd screen has gone blank suddenly while i was trying to chage some timing settings. does it have a battery that needs replacing or will i have to replace the whole device.
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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
It actually sounds like the batteries are going dead if the 24v from the furnace are not providing the power to the thermostat.
Posted on Jan 23, 2010
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