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What thermostat make and model are you using?
the thermostat does not do this...and the furnace does not do this.
The only way this furnace can do this is if there is an optional ventilation system (erv or hrv) hooked up for outdoor air....or...the circuit board is defective in the furnace.
I do not understand the techs comment unless you have an optional hrv?
There are some homes tat ave an optional energy recovery ventilator or also known as heat recovery ventilator. This is a separate unit that draws outdoor air into the home while exhausting stale air.
If you can post a pic of the furnace with doors off I can tellyou....BUT less than 5% home have these. I am actually thinking you have a bad ciircuit board but I want to cover the bases
it would be a separate unit with piping to the outside and then piping to the duct work of furnace.
Can you read the tech report or tell me what the report was?
Sounds very suspect to me.
This furnace does not have a feature like that and the thermostat does not either.
If under home warranty the circuit board would be replaced. I think this is worth a look at by the company again.
I would call them back and relay that you are not understanding what part he says needs bypassed and why it is not under warranty if something is wrong. Even ask for another tech to make a courtesy call.
Something does not sound right......Plus I can think of nothing that would take $300 to disconnect
now I am even more suspect if he did not go to attic to check the main unit.
Do you have another control other than the thermostat anywhere?
than I really cannot see how a circulation fan operation could be determined without going into the attic.??