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What is model on heater?
On most of these Lennox units, the slow flash means we have power but thermostat is not calling for heat. Try connecting the thermostat wires from heater together and see if it will come on.We will go from here.
THis troubleshooting error codes on Lennox unit
OK problem is in thermostat then. Tell me model on thermostat and how you have it wired.
Ok if you touch this R and W at thermostat and heater will come on but not when wires are connected and calling for heat on thermostat, the thermostat is defective.
Did you connect the wires here or at heater? You may have a break in wire in between
That is what I thought. That tells us thermostat must be the issue .
Do you have the fan switch on thermo in AUTO position?
That is a universal thermostat that can be used with a normal central system I have seen it cause an issue . Just for fun lets put fan in Auto and see if it makes a difference. Really should not since we don't have a wire connected to G but I have seen it do so.
I meant reconnect wires to thermostat and see if we could thermostat to bring it on.
If you have further questions, please let me know.
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