User's Manual

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Troubleshooting

Heating equipment is running in cool mode

• Check the Equipment Type selection switch to make sure it is set to match

the installed heating/cooling equipment (see page 21).

is not displayed

• Make sure that Installer System Setting number 02 (Control Setup) is set

correctly.

• Change the System Mode to Heat, and set the temperature level above the

current room temperature.

is not displayed

• Make sure that Installer System Setting number 02 (Control Setup) is set

correctly.

• Change the System Mode to Cool, and set the temperature level below the

current room temperature.

Humidiﬁer does not operate in Auto Mode

• Make sure that Installer System Setting number 16 (Outdoor Sensor) is set

to Ye s.

• Verify that the outdoor sensor is functioning correctly. If the sensor failed,

you will see a “CHECK OUTDOOR SENSOR” message displayed in the

message center.

Error codes

If the thermostat enters an error mode, all outputs are turned o. The thermostat

attempts to recover every 10 minutes.

Error code Message Error Description

“SENSOR ERROR”

Primary sensor failure with no secondary sensor assigned.

02 Primary and secondary sensor failure.

03 “EEPROM ERROR” Error in permanent memory.