He said he heard the click.
IF the blower does not come on.. Thermostat
If the blower comes on but no attempt to ignite. Batteries are low
IF it tries to ignite, Succedes, but shuts down a few seconds alter
Trouoble shoot as follows
Check Thermocouple to control board wire, DISCONNECT (Both ends one at a time) and re-connect a few times to clean the contacts.
Check and clean the thermocouple itself
Sadly, I had to replace the control board
OEM (Attwood or Suburban) Roughly 250 Plus S&H
Dinosaur board 108 in my hand.
Observations by a trained electronics tech.. That Dino board is very very well built, I'd give it a 10 quality wise.. From the design phase up it's better than the OEM.. and less than half the price as well.