My gas furnace is a Lennox G24M3/4-100A-2 and the installation instruction shows the year is 1995.When I turn on the thermostat the blower will come on, but after a while the gas valve will click continually to do open and close.I test the valve's voltage it is changing rapidly. This problem only happened in cold weather.I tried a method to temporarily solve this issue. I use a fan heater heats the gas valve aera about 30 seconds,then I turn on it will work fine. Last week was very cold here, so I had to keep heating the gas valve whenever the furnace started, otherwise the gas valve would be clicking.I changed the gas valve, but the problem still remains. I also changed the Primary limit control switch, Pressure switch, Flame sensor, Direct spark ignitor and two Flame rollout switchs.They all are not helping. I am exhausted. Please help me. Ron He
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