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Check the followings:
# S& U* }2 {. `+ d J* o1. Air filter is clean? most time dirt filter restricts the air flow, even it will shut down the furnace if there is too much air pressure loss on the air filter ( there is air differential pressure sensor to cut off the furnace)
8 B# N Y3 M+ m0 }6 A- P2. Furnace start-up sequence check: most furnace shall be: start-up signal relay on click sound, exhaust induce fan (small fan) on ( purging air), ignition on, flame on, then main blower on which has big sound and bring the air to your rooms& _7 a6 B- L b
3. In front of the furnace, check if there is any flame on during the start-up. You can see the flame thorough the small openings of the furnace cover. % p) ]$ T8 C @/ _ |, u
4. if there is flame on then off, ( the blower will still be on for a while) most probably it could be the overheating cut-off sensor interlock the flame, due to some restriction of the air flow in the system.
" p" o: `' I" q- I4 r3 B5. if there is no flame on at all, could be the ignition is no good or exhausting temperature sensor at exhausting duct not good and interlock the ignition....
& o2 H: P7 D& b0 T3 L6. Check the bottom cover of the furnace, there is a round glass. Look thorough if there is any red led light flashing. if there is any fault, this led light will flash two different speed then stay for a while. then flash again. Give me the number first fast flash, and the number of the second slow flash. according the number of the 2 flashings, you can check the fault code right in the front of the furnace cover. It will tell you what is the problem.
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In your case, most probably could be the overheating sensor cut-off if the furnace start/stop very often but no heat coming out from vents, due to some restriction by air flow, vents, ...But it needs more check out yourself and let me know if you need more instruction.3 C7 n" n9 [0 {
; L9 T% ~ N/ H: j0 a( J" zYou also can call ATCO for check up once every year for free. text me at: 7808802698 if you prefer sharing my HVAC experience.
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发表于 2014-11-11 09:23
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