trader_4 wrote:
On Monday, December 22, 2014 4:55:35 PM UTC-5, Ralph Mowery wrote:
"trader_4" wrote in message
...
It's not an air handler blower issue. He gets the flashing trouble
indication as soon as power is applied, without any call for heat, without
the furnace firing, without the blower ever starting.


He was getting that flashing , but he just said the heater tried to start
after he did all the resetting and checking later on.

Again, "tried to start", is not an air handler blower problem. If the
blower failed, there were clogged filters, etc, the furnace would fire up.
run for several minutes, then shut off with a failure code.


The heater could have came on at the very start and failed. This could have
tripped a safety device and he finally reset it, only to have it fault again
on the restart attempt.



Two problems with that:

1 - It has continous blinking, ie abnormal LED as soon as power is restored. It's not firing and then reporting a problem.

2 - If it fired at the very start and failed, it's also not a blower
problem. The blower typically comes on about 2 mins into the whole
startup. For it to reach an over temp and shut down, would require a
lot longer.





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Hi,
First, I'd just clean the flame sensor to get one thing out of the way.
I never ran into failed sensor but dirty one which did not work well.
Rubbing it with emery cloth always made it work again.