Hi. Have the Goodman GMT since 2004, went on vacation for 3 weeks with the heater turn off. Came back the heater won't start. Opened the panel resetting the switch and didn''t hear any click or ignition. Please help, Thank you.

Did you check the breaker?, look through the little peep hole on door panel do you see a small light? Will be in the end where the blower motor is