carver trumatic. Heaters. SL3002 SLP3002 SL5002. Accessories. Air Mix Comfort Kit. Ducted Hot Air. $13002. OPERATING &. SERVICING. INSTRUCTIONS Gary is the guru on all things Carver/Truma. There are a few manuals on his website for download along with exploded views.My instructions say remove the heater cover,push the battery compartment up and change the battery. Sounds simple if you know what to look for