Original message
| nasaelvis56
 |  "sv9501"
, posted Thu 9 Oct 16:47  
The furnace ignites like it's supposed to, runs for about 10 minutes and then all flames go out abruptly as if a safety system has kicked in. The fan continues to run, but the flame never re-ignites.
I've replaced the Q3400 igniter.
Could the sv9501M2726 control be bad?
John
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Replies:
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| Primo382
| "Re(1):sv9501" , posted Fri 10 Oct 09:51:
it doesn't sounds like the flame sensor because you are getting heat for 10 minutes, but it sounds like maybe one of the rollout switches is defective causing it to think it's overheating and shutting the system down. Most of these switches have a reset button between the two terminals. If resetting the 3 or 4 switches doesn't solve it, try using a jumper wire to bypass each switch, one at a time, until you are able to isolate the faulty switch. There is also a limit switch that is mounted facing in towards the heat exchanger that can be bypassed in the same way (usually black plastic rectangular shaped flat plate with 2 terminals). Most of the time this is an easy and inexpensive fix.
Also, before hand check the board to get a trouble code from the flashing red led light on the board when it shuts down. These usually tell you exactly where to begin. Hope some of this helps, good luck!
P.S. the fan continues to run to cool the unit down because it is still hot.
[this message was edited by Primo382 on Fri 10 Oct 09:55] |
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