Reset; Step 5: Troubleshooting; Backlit Display - Robertshaw 9555 User Manual

110-975D En.qxd

Backlit Display

This thermostat is equipped with a backlight to make nighttime tempera-
ture adjustments quick and easy. Press the
backlight. The backlight will turn off after about 15 seconds of inactivity.

Reset

To reset the thermostat to factory preprogrammed conditions,
press the RESET button located beneath the lower left corner
of the display.

Step 5: Troubleshooting

Symptom
Thermostat does not turn on system.
Thermostat turns system on and
off too frequently.
System fan does not operate
properly.
Thermostat does not display
proper room temperature.
Er on display
If problems with thermostat cannot be resolved, call:
5/13/03
RESET Switch
Technical Support: (800) 445-8299
Monday-Friday 7:30 AM - 5:30 PM CST
2:43 PM Page 11
button to activate the
NON HP
Remedy
Check wiring (see Installation
section).
Increase temperature differential
(see Changing the Temperature
Differential section).
Move fan option switch to either
gas or electric, to match system
(see Installation section).
Check F/C (Fahrenheit/Celsius)
setting. See Changing Fahrenheit
(F) to Celsius (C).
Call technical support.
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(Black plate)