Thermostat not working?

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Lord Whorfin

New Member
Nov 2, 2026
13
Vermont
Hello all:
PF 100, thermostat in living room, furnace in basement. Thermostat does not have any effect on furnace heat output. Manual light mode, I expect to keep a fire going, but fire will not slow whether thermostat is set a maximum or minimum. Main blower always running. Limit switch checked, no issues.

recently replaced ESP probe (black wire), main circuit board (dip switches set per manual, especially # 5)