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Honeywell st9400c lcd screen has gone blank

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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SOURCE: honeywell chronotherm IV Plus thermostat

There are no batteries on an 8600-8601-8602 series

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SOURCE: Honeywell ST6400C - hot water not working

some digital thermostats do no not work with zone valves is this a new thermostat that you had installed

Posted on May 10, 2009

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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

kingbrizzle
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SOURCE: honeywell thermostat t8400c intermittent blank screen

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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SOURCE: boiler is a baxi control for heating is honeywell.

this will be your diaphram inside your divertor valve.
the one that looks like a spaceship.
it will e split.

Posted on Jan 31, 2010

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