28 year old residential gas furnace won't light, problem solved
This furnace won't start. The main limit has tripped, and the board is in lockout. First thing was turn off power. Then change filter. The motor and capacitor were tested. Capacitor was low. While it was off the flame sensor and pressure tube were cleaned. Power on and lockout is gone. Furnace is working again. Sometimes the board is bad but not today. 28 years and still heating.
The furnace flames come on but the blower doesn't
The blower runs constantly but no heat
The flames come on but go right out
The thermostat clicks on but the furnace never starts
The thermostat clicks on but the air conditioner won't start
The fan comes on but its not cooling
The fan on a/c isn't spinning
The air conditioner is buzzing and won't come on
The a/c makes a loud noise but doesn't start
The ac has a humming but not coming on
The air conditioner is running but not cooling