Honeywell RTH7500 Series Quick Installation Manual page 17

3
When the alert icon appears, check
the error code with the table below to
determine the problem.
4
Snooze the alert.
5
Dismiss the alert.
Alerts codes
Number Alert/Reminder
170 Internal Memory Error
173 Thermostat
Temperature Sensor
Error
181 Replace Air Filter (1)
405 Low Battery Alert
407 Critical Low Battery
Definition
The memory of the thermostat has encountered an
error. Please replace the thermostat.
The sensor of the thermostat has encountered an
error. Please replace the thermostat.
Replace air filter (1). Reset the timer by touching
the "dismiss" button on thermostat screen after it is
replaced.
The batteries are getting low. Replace them within two
months.
The batteries are almost depleted and should be
replaced as soon as possible.
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RTH7500 Series