Troubleshooting - Honeywell RTH5100B Owner's Manual

Troubleshooting

If you have difficulty with your thermostat, please try the following suggestions.
Most problems can be corrected quickly and easily.
Display is blank
Temperature
settings do not
change
Cannot change
system setting to
Cool
Fan does not turn
on when heat is
required
Heating or cooling
system does not
respond
"Cool On" or
"Heat On" is
flashing
Heat pump issues
cool air in heat
mode, or warm air
in cool mode
Heating and
cooling equipment
running at the
same time (or heat
does not turn off)
Heating system
is running in cool
mode
For assistance with this product, please visit http://yourhome.honeywell.com or
call Honeywell Customer Care toll-free at 1-800-468-1502.
• Make sure fresh AAA alkaline batteries are correctly installed
Make sure heating and cooling temperatures are set to acceptable ranges:
• Heat: 40° to 90°F (4.5° to 32°C).
• Cool: 50° to 99°F (10° to 37°C).
• Check Function 1: System Type to make sure it is set to match your heating
and cooling equipment
• Check Function 3: Heating Fan Control to make sure it is set to match your
heating equipment
• Press SYSTEM button to set system to Heat. Make sure the temperature is
set higher than the Inside temperature.
• Press SYSTEM button to set system to Cool. Make sure the temperature is
set lower than the Inside temperature.
• Check circuit breaker and reset if necessary.
• Make sure power switch at heating & cooling system is on.
• Make sure furnace door is closed securely.
• Wait 5 minutes for the system to respond.
• Compressor protection feature is engaged. Wait 5 minutes for the system to
restart safely, without damage to the compressor.
• Check Function 2: Heat Pump Changeover Valve to make sure it is properly
configured for your system
• Check Function 1: System Type to make sure it is set to match your heating
and cooling equipment.
• Grasp and pull thermostat away from wallplate. Check to make sure bare
wires are not touching each other.
• Check Function 1: System Type to make sure it is set to match your heating
and cooling equipment
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