Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater
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Posted on Jan 02, 2017
SOURCE: No hot water honeywell st6400c
HW valve was stuck in the open posiion and the micro-switch was not working so thats why boiler and pump were not starting. Bled system to below the level of the valve to be changed, and replaced valve with a drayton ( easy quick change of valve head if needed no screws )
Posted on Sep 17, 2008
there are currently 60 honeywell thermostats made i have no idea witch one you have , but a lot of the new ones run on batterys you might be seeing a low battery signal . look for a door where batterys might be and replace them
Posted on Jan 15, 2009
SOURCE: Programmable T stat
your trane heat pump energizes the reversing valve with O - orange y - is to turn on the unit make sure you have your orange wire hooked up and the tstat programming set to heatpump otherwise your reversing valve might be bad
Posted on Jun 30, 2009
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