問個furnace的問題

有furnace,點火1分半鍾,熄火(伴隨啪啪兩聲),再過30秒,風扇停,再過1分種,點火電熱絲發紅,10秒後點火。循環往複。屋裏溫度68,設置72。什麽問題?

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Was it good before? Sounds like not enough return airflow. -borisg- 給 borisg 發送悄悄話 borisg 的博客首頁 (0 bytes) () 12/20/2012 postreply 12:52:37

tenants said it is always like that. today is cold, the heat is -sweetptt- 給 sweetptt 發送悄悄話 sweetptt 的博客首頁 (0 bytes) () 12/20/2012 postreply 12:57:10

Then it is either return clogged by junk or the vent layout is f -borisg- 給 borisg 發送悄悄話 borisg 的博客首頁 (0 bytes) () 12/20/2012 postreply 13:07:51

聽起來像熱傳感器不靈了,一個細細的金屬棒,卸下來 -David2005- 給 David2005 發送悄悄話 (31 bytes) () 12/20/2012 postreply 14:00:09

yeah,try clean the flame sensor first -地主老頭兒- 給 地主老頭兒 發送悄悄話 (0 bytes) () 12/20/2012 postreply 14:28:22

upper limit switch is fault. -jy101- 給 jy101 發送悄悄話 jy101 的博客首頁 (0 bytes) () 12/20/2012 postreply 17:01:38

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