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69-1491–1
Troubleshooting Guide
CAUTION
Operating at too low of an outdoor temperature
may cause compressor damage.
Damage to compressor possible.
Do not operate cooling if outdoor temperature is
below 50°F (10°C). Refer to manufacturer’s
recommendations.
Heating or cooling does not come on.
• Check power to the heating or cooling equipment.
For compressor protection on initial startup and during
power interruptions, the T8400 and T8401 Electronic
Thermostats go into a five-minute delay. During this
delay, the cooling icon, a snowflake flashes.
• Check that the SYSTEM switch on the thermostat is set
to Heat or Cool.
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