15 69-1557
Troubleshooting

continued

Symptom Action
Display does not come on. •Check if the thermostat is mounted and latched on the
wallplate—mount and latch the thermostat on the
wallplate.
•Check if the circuit breaker is tripped—reset the circuit
breaker.
•Check if the fuse is blown—replace the fuse.
•Check if the switch at the equipment is in the Off
position—set to the On position.
Temperature settings do not
change (example: cannot set the
heating higher or the cooling
lower).
•Check that the temperature setpoints are: between 40
to 99°F (4 to 37°C).