Robertshaw RS4220C Manuel De L'utilisateur page 10

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Troubleshooting
Problem
Thermostat does not turn on system.
System turns on too often.
System fan does not operate properly.
Thermostat does not display proper
room temperature.
Display Shows HI or LO and room
temperature is normal.
If problems with thermostat cannot be resolved, call:
www.invensyscontrols.com
Technical Support: (800) 445-8299
Action
Check wiring.
(See Wiring Diagrams section.)
Increase temperature differential.
(See Changing: Scale, Clock Mode,
Differential, Filter Hours, Short Cycle,
or Offset section.)
Move fan option switch to either gas
or electric, to match system.
(See Switch Locations section.)
Check F/C (Fahrenheit/Celsius) setting.
(See Changing: Scale or Calibration
section.)
Call a licensed service person to
replace/repair.
or
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