On Wed, 15 Dec 2004 04:40:53 +0000, tripntx
wrote:


Lennox Model G24M3-75A-4

When selecting heat, fan comes on with heat demand and ignitors start
immediately clicking. This shouldn't happen. Ignitors should wait 45
seconds before clicking. It'll keep repeating until locked out.

When ignitors start clicking when blower starting, I'll move temp down
and after turning system on/off moving temp up/down several times, make
that numerous times over a two hour period, the system will finally
work. Meaning, fan comes on and after a 45 second delay the ignitors
click and the system works.

Furnace will work normally until termostat manually set to cool. Then
problem starts over again when the need to return thermostat to heat.

Other symptoms a
It'll display solid diagnostic lights indicating control board failure
after a few attempts, but not at first;
set fan from auto to ON and fan doesn't work, just makes a soft
clicking noise, control board will indicate board failure;
Air Conditioner works everytime when placed to cool.

What/which parts do I change first?

What is causing ignitors to click at same time as blower starting?

Why doesn't my fan work when set to ON?

Please help.

You obviously dont have a clue how the system works. Thats ok. You
shouldnt. Thats why there are repair techs take care of it. No one can
diagnose it over the net. Get it looked at by a qualified technician.
You'll most likely save a lot of money in the long run.
OR, you can just change parts until you get it right.
Note: Lennox parts are very costly compared to others and they are
almost impossible for the homeowner to purchase.
Bubba