I have just bought a new programmable themostat and in the directions it says it is not compatible with a mulistage furnace.
My furnace is a Lennox Pulse.

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Originally Posted by Rhall5445

I have just bought a new programmable themostat and in the directions it says it is not compatiable with a mulistage furnace.
My furnace is a Lennox Pulse.

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If you still have the receipt, you could take it back and look for the correct model for your furnace. Check the manufacturers website for possible technical advice and maybe a toll-free phone number. That worked for me with Hunter.

You may be able to select a program in the furnace by setting switches on the circuit board to control the stages. That is how my 2 stage Bryant is set up with a single stage thermostat. You would need to consult the installation manual for the furnace.