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KAPar
Nov 10, 2007, 11:42 AM
Why does my DICO Thermostat keep shutting off my heat after being lit only 10 seconds?
hvac1000
Nov 10, 2007, 11:55 AM
Is this the Dico unit in the furnace?
Hopefully Helpful
Nov 10, 2007, 12:22 PM
Why does my DICO Thermostat keep shutting off my heat after being lit only 10 seconds?
How do you know it's thermostat? is there 24V on W at the furnace? after 10 seconds I would say it is ( if this is a electronic ignition type) the furnace. jump R and W at the furnace to see if this is same problem if it isn't check by jumping the wires at the thermostat - if the furnace works fine (runs) then check the setting on the thermostat and check the amp draw on the gas valve.
labman
Nov 10, 2007, 01:50 PM
Sounds like it could be a flame sensor problem. I would goto the sticky at http://www.askmehelpdesk.com/heating-air-conditioning/heating-cooling-maintenance-repair-troubleshooting-frequently-asked-questions-58313.html
and read the section on sequence of operations. Near the bottom of the sticky there are pictures including one of the flame sensor.