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HW420KARI
Oct 2, 2013, 09:41 AM
The burner starts but the fan will not kick on.. could it be the thermostat sub base or fan limit switch circuit board?

Grady White
Oct 3, 2013, 07:12 PM
If it has a fan/limit switch, check for 120 volts from the fan terminal to ground. This measurement must be made after the dial rotates past the fan on setting.