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Vanessa HartAug 3, 2025
How to fix Robertshaw 8425 that does not turn on system?
- JJuan MorrisAug 3, 2025
If your Robertshaw Thermostat isn't turning on the system, check the wiring. Refer to the Installation section for wiring details.
To Next PageTo Next PageHow to fix Robertshaw 8425 that does not turn on system?
If your Robertshaw Thermostat isn't turning on the system, check the wiring. Refer to the Installation section for wiring details.
Why does my Robertshaw 8425 Thermostat turn on and off too frequently?
If your Robertshaw Thermostat is turning the system on and off too frequently, you should increase the temperature differential. Please refer to the section on changing the temperature differential for instructions.
What to do if my Robertshaw 8425 does not display proper room temperature?
If your Robertshaw Thermostat isn't showing the correct room temperature, verify the F/C (Fahrenheit/Celsius) setting. Consult the section on changing Fahrenheit to Celsius for guidance.
What to do if my Robertshaw 8425 system fan does not operate properly?
If the system fan on your Robertshaw Thermostat isn't working as expected, move the Electric/Gas switch to either gas or electric, ensuring it matches your system type. For detailed instructions, refer to the Installation section.
General| Type | Non-programmable |
|---|---|
| Temperature Range | 45°F to 90°F (7°C to 32°C) |
| Compatibility | Single Stage Heating and Cooling Systems |
| Stages | 1 Heat/1 Cool |
| Mounting | Wall Mount |
| Voltage | 24V AC |
| Power Source | Battery |
Details old terminal labels and their corresponding new labels and functions, emphasizing the C terminal.
Warning about connecting to W1 terminal in heat pump applications and internal connections.
Details on stripping wires, inserting them into terminals, and ensuring secure connections.
Explanation of each terminal's purpose and connection requirements.
Procedure to test the thermostat's cooling function and compressor delay.
Procedure to test heating modes, including primary, secondary, and emergency heat.
Testing the fan operation in both ON and AUTO modes.
