Gas furnace heating system problem

Anyone ever has this proble? gas furnace heating system stops working when temperature is very low, like below 32F, but it starts working again when the temperature gets warmer like above 32F. A HVAC technicion came two times still could not find the problem.

所有跟帖： 

• what is your boiler temp set at? -calvinwch- ♂ (0 bytes) () 01/10/2017 postreply 12:30:15

• It is gas furnace, not boiler type, thanks. -河北卡- ♀ (0 bytes) () 01/10/2017 postreply 12:39:14

• samething, there is thermostat on the furnance too. make sure i -calvinwch- ♂ (67 bytes) () 01/10/2017 postreply 12:45:33

• HVAC tech came two time -河北卡- ♀ (382 bytes) () 01/10/2017 postreply 12:44:24

• possible over heating ( over burn ) -calvinwch- ♂ (223 bytes) () 01/10/2017 postreply 12:54:24

• Thanks, will try to see if can find the thermostate -河北卡- ♀ (280 bytes) () 01/10/2017 postreply 13:13:28

• it should be behind the panel for furnace look like this. -calvinwch- ♂ (87 bytes) () 01/10/2017 postreply 13:18:21

• Thanks a lot! -河北卡- ♀ (0 bytes) () 01/10/2017 postreply 13:21:10

• Do not turn it more than 190 for an inexperienced person. -不开窍- ♂ (0 bytes) () 01/10/2017 postreply 13:43:38

• Thank you! -河北卡- ♀ (300 bytes) () 01/10/2017 postreply 15:05:22

• 老的furnace会有这个fan limit switch。新的furnace不一定有这玩意 -baohulu- ♂ (0 bytes) () 01/10/2017 postreply 15:45:27

• 检查一下所有的出风口是否有关闭或者阻塞 -firefly2000- ♀ (899 bytes) () 01/10/2017 postreply 13:53:49

• Thanks, this might be the problem -河北卡- ♀ (241 bytes) () 01/10/2017 postreply 18:42:54

• 打开所有的出风口，清理干净Flame Sensor。很容易的，去油管找视频：how to clean gas furnace f -润涛阎- ♂ (0 bytes) () 01/10/2017 postreply 16:37:33

• I got a same problem as this. Changed thermostat, the problem wa -youzifive- ♀ (0 bytes) () 01/11/2017 postreply 05:30:34