I have a chronotherm 3 thermostat, Lennox ECB19 12.59 furnace and a Lennox HP19-651-6d heat pump. The heat pump stopped working and then the furnace won't turn off, fan runs on high, I pushed the reset button on the heat pump where the blue wire is attached and now the heat pump work fine. But the furnace still won't stop running I have to turn it off at the braker in the house. I got a new thermostat and that didn't fix the problem. I replaced the three heat relays and I believe to be the blower/fan relay part#90-340 by white-rodgers. And still the fan won't turn off I also removed the green wire at the therm and it won't turn off any help would be apperacated.

Find and replace the fan relay or timer or sequencer that controls the fan. The fan is being held on by one of these controls