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Troubleshooting
If you have difficulty with your thermostat, please try the following suggestions.
Most problems can be corrected quickly and easily.
Display is blank • Thermostat can be powered by AA Alkaline batteries, with a common wire
Heating or
cooling system
does not respond
Temperature
settings do not
change
"Cool On" or
"Heat On" is
flashing
Aux heat runs in
cooling
Cool runs with a
call for heat
CAUTION: ELECTRICAL HAZARD
Can cause electrical shock or equipment damage. Disconnect power before
beginning installation.
CAUTION: EQUIPMENT DAMAGE HAZARD
Compressor protection is bypassed during testing. To prevent equipment
damage, avoid cycling the compressor quickly.
CAUTION: MERCURY NOTICE
If this product is replacing a control that contains mercury in a sealed
tube, do not place the old control in the trash. Contact your local waste
management authority for instructions regarding recycling and proper
disposal.
CAUTION: ELECTRONIC WASTE NOTICE
The product and batteries should not be disposed of with other household
waste. Check for the nearest authorized collection centers or authorized
recyclers. The correct disposal of end of life equipment will help prevent
negative consequences for the environment and human health.
to C, or both. Verify 24 volt power or AA batteries are good. Check circuit
breaker and reset if necessary.
• Check circuit breaker and reset if necessary.
• Make sure power switch for heating & cooling system is on.
• Make sure furnace door is closed securely.
• Make sure fresh AA alkaline batteries are correctly installed (see page 3).
• Press Mode button to set system Heat (see page 5). Make sure the
desired temperature is set higher than the inside temperature.
• Press Mode button to set system Cool (see page 5). Make sure the desired
temperature is set lower than the inside temperature.
• Check circuit breaker and reset if necessary.
• Make sure power switch for heating & cooling system is on.
• Make sure furnace door is closed securely.
• Wait 5 minutes for the system to respond.
Make sure heating and cooling temperatures are set to acceptable ranges:
• Heat: 32 °F to 90 °F (0 °C to 32.0 °C)
• Cool: 50 °F to 99 °F (10.0 °C to 37.0 °C)
• Compressor protection feature is engaged. Wait 5 minutes for the system to
restart safely, without damage to the compressor.
• For heat pump systems, verify there is not a wire attached to the W terminal
on the base plate.
•
See "Wiring heat pump systems" on page 4.
• For heat pump systems, verify there is not a wire attached to the W terminal
on the base plate. See "Wiring heat pump systems" on page 4.
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