trader_4 wrote:
On Thursday, October 12, 2017 at 6:44:07 PM UTC-4, MarkB wrote:
Model DGAT090BDD
Furnace will turn on, ignite, blower comes on, but when calls for the propane
to come in, it clicks, stays running, but blows cold air.
The green indicator light blinks 5 times

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I believe what you're saying is that it goes normally until it should light.
Is the click sound coming from the gas valve solenoid? Have a voltmeter
to see if it has 24V for it to open? If it's clicking, I'd check for
gas before the valve, any chance of an obstruction? The inside of the
door panels usually have the key to the number of blinks and the problem.
Sounds like the igniter is hot, but the gas doesn't arrive to get lit.

He might also check for an open coil on the gas valve. This in not
uncommon. Do so with one wire on the coil disconnected.