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I just replaced the thermostat for my system- replaced old Honeywell with a newer Honeywell - both have identical lead screws on the back, and I have checked dip switches, etc.
The A/C works, as does the manual fan control, but the Lennox heater (m/n 8OUHG475A2) will not start. I hear clicking, but no luck with the restart. I closed the unit's gas valve for 5 minutes and then tried again - no luck.
Could the thermostat be bad, or do I have a pilot problem?
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