Hi! I have a question. Recently my furnace started to act funny. It starts and heats up fine but towards the middle/ end of cycle you can hear the air flow slow then speed up and keep repeating and while it's doing that you can hear a rapid clicking sound. The burners will eventually shut off and the air flow will be normal again. I can hear the air flow difference through vents but worse next to furnace. I have new air filter and checked for blockage and build up. No error codes. Slow green light blinks while off then amber lights blinks slow flash while on. It's a luxaire furnace .Also the other day my thermostat wouldn't shut off heat at set temperature but that seems to be ok now unless it's going bad? Changed batteries. I'm not sure if this is safe to be running or not? Hope you can help! 😀

 

Welcome to the forums.

Can't diagnose that problem without knowing what type of furnace you have. You will need to remove the burner access door and post the full model number that is posted on the ID tag on the side wall near the burner.