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Old 10-24-2017, 12:03 PM   #1
Junior Member
Join Date: Oct 2010
Location: Alabama 35633
Posts: 14
Exclamation 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!

2007 Sportsmobile FRB-50 4X4 Diesel, Aluminess front & rear, Espar D4 Airtronic, XL storage, leather, Kenwood GPS, electric Penthouse, Solar panels
2003 GMC Sierra 2500HD 4X4 Duramax Diesel
2006 Jeep Wrangler Rubicon LJ
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Old 10-24-2017, 01:20 PM   #2
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Join Date: Aug 2016
Location: Reno, NV
Posts: 1,389

Espar wiring diagrams and instructions leave much to be desired. Luckily I found a website where the guy had my exact controller and followed his directions.

Only issue is my temp sensor sits in a hot spot so I have to keep pumping up the temp. Easy fix though.
Tim - 2013 EB V10 Agile 4x4 SMB PH Ginger Army All Terrain Mobile HQ
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