I have a trane thermostat and I need help programming it

Had error code 91 on Trane XL19i thermostat. Heat season on duel fuel system. Repair tech said board is bad ($963) and transducer ($1000). Unit is 3 ton 12 years old. Does it make sense to repair or put in a new unit?

if you have a wire on the g terminal try 4

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You could have a shorted gas valve.

You probably have it running a program. Try using it simply on heat mode. Then set temperature and press hold on thermostat. The word hold should show up on the screen.

At your thermostat ,
Set switch to heat, turn up temp switch.
Fan should be set to auto. Wait up to 5 mins to be surethat somthing is wrong. If your fan comes on without heat. Check gas valve or if heat pump check main a/c breaker. If elect heat or any of above dosn't work.
Call a service company. If your in Pensacola. Look up Absolute Heating and Air Conditioning.

you can switch the thermostat to "emergency heat" which will turn the outdoor section off and the thermostat will control the electric heat elements in the air handler if it has them.

your trane heat pump energizes the reversing valve with O - orange y - is to turn on the unit make sure you have your orange wire hooked up and the tstat programming set to heatpump otherwise your reversing valve might be bad

Your second stage heat check the dip switches on the board and the wires to the proper two stage heat t-stat.

you have to configure the thermostat to run the fan when there is a call for heat. look at the installation instructions and they shoud ask you if it is gas or electric heat if its electric then you are gong to have to configure it to makr e the fan come on with the heat. Good luck

OMG! has anyone came up with a solution? I have the same problem as mlc3530b