My 8 year old Trane Model tuh2d120a9v5va furnace is not giving out heat, but the blower is on. The service people are all busy due to the recent storms. I imagine the ignition is not working.

There is a little glass viewing window. I see red and green flashing lights. The red flashes 4 times, the green 3 times, and these overlap. What do these lights mean?

  • Model tuh2d 120a9 v5va YES. There is info on the inside of the access panel. Four red flashes means open limit switch. That seems like real work (and expensive). – Yehuda_NYC Mar 8 '18 at 15:40
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    @Yehuda_NYC, might not be "real work" or that expensive. Some limit switches can be reset with a button, and some may need to be cleaned, etc. – JPhi1618 Mar 8 '18 at 15:52
  • That doesn't look like a model number (and doesn't return search results). Please add to and update your post instead of putting new information in comments. – isherwood Mar 8 '18 at 15:58
  • As JPhi said, fixes like this are often a matter of cleaning carbon off a sensor or simply replacing it. Furnace parts aren't usually terribly expensive. The cost of repair by a professional covers trip expenses and liability for repairs and incidentals. It doesn't reflect just the actual repair cost. Finding the problem can be tricky, but that's 90% of the battle. I've saved $thousands by replacing inducer fans, blower motors, and smaller components myself with little experience. – isherwood Mar 8 '18 at 16:01
  • @isherwood Why not put your comment on looking at the inside panel for the codes. – Yehuda_NYC Mar 8 '18 at 16:33

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