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Hello, at less than one year old, the system should still be under full warranty from the dealer... I will stay with you to the end on this, however right now see if you can get the dealer to send a man out, mention the 100 year old vet who is largely responsible for us living in a free country today.
Tell me where the e5 code I showing up, on the furnace or at the thermostat. We can go from there.