Posted by Crazy Horse on February 05, 2019 at 07:31:23 from (75.158.37.1):
We have a 20-year old mid-efficiency Lennox furnace. Now and then it decides to quit working, usually for the same flashing light codes. I have waited them out sometimes and they will kick back in on their own but I usually correct things by dropping the thermostat setting upstairs and then setting it back to the regular setting. I have the flow chart with all the possibilities of flashing lights which for the most part is pretty confusing to figure out what is causing it ..... but that's not my question. Here it is ....
When an HVAC tech comes to the house and all is working well with the furnace, can he still determine the exact issue without the problem happening when he is there? I would be able to tell him the flashing light sequence during the shut down. Maybe it's like the auto repair trade where they tell you they can't fix anything until it acts up.
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