Thor Forums

[javelin]

Just a followup comment. If your furnace is sparking several times and not lighting; then after attempting to light several times, but still not lighting; then won’t try sparking again; the control board may be locking out. That might also explain not hearing more sparking sometimes from your description. You need to turn off/down the thermostat below the call for heat threshold for a short time to reset the control board and then it should resume the sparking attempts again when you call for heat again. If this is your situation then you need to check further into the combustion procedure (gas, gas valve opening, smell gas? Spark not igniting gas; flame sensor mis-adjusted etc.). Check the manual for your furnace as it may also have LED trouble codes that will tell you what fault is occurring.