Airtronic D4 with 7 day timer
My Espar heater never has been right, I am the third owner and the person I purchased my SMB from told me the Espar had issues. I finally figured it out!
Problem: The heater would turn on and heat but would never shut off automatically as it should by the 7 day timer temp setting. It would run on low heat until I manually shut it down.
Fix: At the rear of the 7 day timer there is a connector that apparently was configured by the installer. There is a cabin temp sensor mounted beside the timer that should be connected to the brown with white stripe wire at pin 9 and to the gray wire going to the airtronic heater. My problem was that the gray wire was inserted into pin 1 of the connector. I cut the gray wire at pin 1 and that fixed the problem. Furnace now functions as it should!
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