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

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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