[jomamba]

My Goodman A42-10 air handler does not always come on after the outside unit has been on for the appropriate amount of time (fan delay period).
I have replaced the time delay relay 2 times.
I have tried three different thermostats (programmable and old school type).
To get the air handler to work, we switch the fan switch from auto to on, wait until it blows (this fails some times), turn Heat/AC switch from Off to A/C.
I thought it was a problem of what signals the air handler to start? The outside unit or the thermostat?
2 questions:
1. WTF??
2. If no other suggestions, can the thermostat be wired in such a way to bypass the time delay relay or to force the air handler on (automatically vs. manually)? To heck with the energy savings by waiting until air is cool, the manual thermostat is killing that anyway. (When all else fails, sometimes jumping the orange and green wires in the thermostat will work)

 

[hvactech126]

it may be a bad capacitor. while the stat is calling for fan and the fan does not come on check for line voltage to the motor. Also check the capacitor if you can by taking it to a local motor shop.

 

[jomamba]

I learned that the capacitor is the first thing you check. Consequently, I have extras (2).
I've been fighting this for several years, hence the multiple thermostats, delay relay and capacitors.
I really thought it was an issue of what signals this goodman air handler to activate?
Thermostat or outdoor unit?
My current thermostat has gas vs. elec. jumpers. Manual says gas=outdoor unit signals and elec=thermostat signals.
Tried both.
Everytihing (capacitor, delay relay, thermostat units & thermostat jumpers) I have tried will appear to work for a while.
Then after a random interval the air handler will fail to start.

 

[hvactech126]

while the stat is calling for fan and the fan does not come on check for line voltage to the motor. Also check for 24V from G to C while it is not working.