Trane XL1200 inside blower won't work

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John1

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My blower on my furnace (Trane XE90) won't come on when the A/C (Trane XL1200) is on. If I turn the A/C off and put the fan to manual, the fan comes on with no problem. The condencer on the A/C unit will run, but not the inside fan on the furnace. Do I need to replace the board? Need help
 
Possibly a problem with the thermostat.
As far as I know, the thermostat will send a signal for fan through the same relay on the board when switched to fan "on" versus fan "auto".
 
John1 said:
My blower on my furnace (Trane XE90) won't come on when the A/C (Trane XL1200) is on. If I turn the A/C off and put the fan to manual, the fan comes on with no problem. The condencer on the A/C unit will run, but not the inside fan on the furnace. Do I need to replace the board? Need help
Click to expand...

Most of the electronic boards today, The green post is for manual fan runs the fan on a low speed like the heating speed. When you turn on cooling, the power comes back to the y post which goes to the condenser and also to a different relay that starts the blower on a faster speed. So i would say you have a bad board. Paul
 
I went and bought a new one and replaced it, but that wasn't the answer. Same issues,
thanks for suggesting
 
kok328 said:
Possibly a problem with the thermostat.
As far as I know, the thermostat will send a signal for fan through the same relay on the board when switched to fan "on" versus fan "auto".
Click to expand...
Paul, Thanks for the insight. How much of a problem is it to change the board? It is the UNIVERSAL HOT SURFACE IGNITION CONTROL MODULE (50A55-843) that needs to be replaced.
 
John1 said:
Paul, Thanks for the insight. How much of a problem is it to change the board? It is the UNIVERSAL HOT SURFACE IGNITION CONTROL MODULE (50A55-843) that needs to be replaced.
Click to expand...

If you can let the board hang on the wires and then put the new board on furnace , then install one wire at a time. If you get those wires crossed you will have a real problem. Paul
 
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