How To Operate A Dometic Single Zone (SZ1) RV Thermostat

Become a Patron: https://www.patreon.com/myrvworks Parts and Tools Affiliate Links: https://myrvworks.com/resources/darrens-tool-list/ Service Manuals: https://myrvworks.com/manuals/ http://myrvworks.com Certified Mobile RV Technician, Darren Koepp, shows you how to operate the Dometic SZ1 RV Thermostat. If you are in need of RV Repairs in the Olympic Peninsula area of Washington state, submit a service request on our website at http://myrvworks.com today! To access Diagnostic Mode on the SZ1 thermostat follow these steps: - System in Off mode - Simultaneously press 'Mode', '+' and '-" - LCD will display '00' - Press 'Mode' to exit Diagnostic Command Description 00 = All outputs OFF 01 = Low Speed Fan ON 02 = High Speed Fan ON 03 = Compressor ON 04 = Furnace Output ON 05 = Reversing Valve ON ( Heat Pump Version only ) 06 = Heat Strip ON ( Heat Strip Version only) 07 = LCD shows Room Temperature Or E2 if out of range / Or E3 if thermistor is shorted. 08 = LCD shows inside Coil Temperature Or E5 if missing/open 09 = LCD shows Outdoor Temperature ( Heat Pump Version only) Or E4 if missing/open ERROR CODES: E1 = Loss of communication “Causes Relay Control Module to shut down”; “No operation of any systems” E2 = Indoor room Air Sensor Open/Out of range. “No Heat or Cool operations”; “Fan only mode still operates” E3 = Indoor room Air Sensor is shorted; “No Heat or Cool operations”; “Fan only mode still operates” E4 = Outdoor Temperature Sensor is Open/Out of range. (Heat pump version only); “No Heat Pump operation”; “Air Conditioner, Furnace & fan modes will still operate” E5 = Freeze Sensor Open/Out of Range “No Cool operation”; “Furnace, Heat Strip, Heat Pump & Fan modes will still operate” Topic: Dometic Single Zone (SZ1) Thermostat Operation System: Dometic Air Conditioner SZ1 Thermostat Tools Used: Propper Men's Short Sleeve Tactical Shirt - https://amzn.to/2XXF1Vu Propper Men's Tactical Pant Poly/Cotton Ripstop - https://amzn.to/2Yh4BUC Related Video's: Diagnosing An RV Air Conditioner That Is Not Cooling - https://youtu.be/3VckFAXg1CY Film Date: 8/8/2019 Location: Hansville, WA Camera: Samsung Galaxy Note8 Native Camera 16:9 FHD 1920x1080 Version 9.0.01.38 Audio: Samsung Galaxy Note8 Native Microphone Music: "My RV Works-Jam" Composed by Steve Patry - Four Faces Band