Are you an HVAC engineer? If not you are at a disadvantage. If you have a multimeter, you can disconnect the motor and test it with the meter, or check the voltage on it and test it on direct mains current. So that tests if the motor works. The clicking is relays involved in the management system and start up sequence they all need checking. Also check that the contactor is actually putting out voltage? Hearing a contactor work, only signifies that the solenoid is working, and doesn't tell you if the contacts are burned away and not passing current.
One thing I have found to work is to disconnect the system at the breaker overnight which does a full reset of all the electronics.
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So, blower motor issue? Turn tstat fan to on. Possibly has a capacitor that is bad, motor could be bad, relay could be bad, sequencer or board. You need a voltage meter.
gas and boilers if not fixed correctly generally result in explosions
Gas is not a diy item so get in a professional gas fitter to fix the fault and be safe
Put the red wire from the secondary/24 side of transformer directly to the green. If blower works the problem is outside of machine. Check for small blade style/ car like fuse inside, check float switches. If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79