Step 5: Troubleshooting - Robertshaw 8405 User Manual

110-1088B.qxd 3/8/05

Step 5: Troubleshooting

Symptom
Thermostat does not turn on system.
Thermostat turns system on and
off too frequently.
Display is blank, flashing or
constant LO BATT.
System fan does not operate
properly.
Thermostat does not display
proper room temperature.
Note: Although the thermostat has a low battery indicator, replace the
batteries once a year to prevent leakage and to prevent the ther-
mostat and heat/cooling system from shutting down due to lack
of battery power in the thermostat.
If problems with thermostat cannot be resolved, call:
Technical Support: (800) 445-8299
Monday-Friday 7:30 AM - 5:30 PM CST
For after hours service, a 24-hour automated help line is available.
10:28 AM Page 10
Remedy
Check wiring (see Installation
section).
Increase temperature differential
(see Changing the Temperature
Differential section).
Replace batteries.
Move Electric/Gas switch to
either electric or gas, to match
system (see Installation section).
Check F/C (Fahrenheit/Celsius)
setting. See Changing Fahrenheit
(F) to Celsius (C).
10