You may need a new thermostat!!! For temporary heat, assuming there is not a
problem with the furnace: Remove the thermostat from the wall leaving the
mounting plate. There should be wires on terminals R and W, or possibly RH
and W. Remove those two wires and twist them together. The heat should come
on and remain on as long as they're together




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I have a Honeywell Chronotherm 3 thermostat (T8602) that is giving me
trouble. I use to override the WAKE, SLEEP, etc. settings and use the
thermostat manually by pressing the up or down arrows to get to the
temp I wanted and then press the hold button. Worked great. Can't do
that anymore. When I set it to the temp I want, the furnace will come
on for a few minutes and then stop. Then the thermostat makes a
clicking noise for about 30 seconds. The batteries are fresh. The
thermostat is about 20 years old. Any help would be appreciated.
Thanks.