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TROUBLESHOOTING
DISPLAY IS BLANK
• Check circuit breaker and reset if necessary .
• Make sure power switch at heating & cooling
system is on .
• Make sure furnace door is closed securely .
TEMPERATURE SETTINGS DO NOT CHANGE
Make sure heating and cooling temperatures are set to
acceptable ranges:
• Heat: 40° to 90°F (4° to 32°C) .
• Cool: 50° to 99°F (10° to 37°C) .
22
HEATING SYSTEM DOES NOT RESPOND
("HEATING" APPEARS ON SCREEN)
• Check for 24 VAC at the equipment on the secondary
side of the transformer between power and
common . If voltage is not present, check the heating
equipment to find the cause of the problem .
• Check for 24 VAC between the heat terminal (W)
and the transformer common . If 24 VAC is present,
the thermostat is functional . Check the heating
equipment to find the cause of the problem .
• Check for loose or broken wires between the
thermostat and the heating equipment .
TROUBLESHOOTING
COOLING SYSTEM DOES NOT RESPOND
("COOLING" APPEARS ON SCREEN)
• Check for 24 VAC at the equipment on the secondary
side of the transformer between power and
common . If voltage is not present, check the cooling
equipment to find the cause of the problem .
• Check for 24 VAC between the cooling terminal (Y)
and the transformer common . If 24 VAC is present,
the thermostat is functional . Check the cooling
system to find the cause of the problem .
• Check for loose or broken wires between the
thermostat and the cooling equipment .
FAN DOES NOT TURN ON IN A CALL FOR HEAT
• Check System Setting #07 (Fan Control), to make
sure the fan control is properly set to match the type
of system (see page 12) .
HEAT PUMP ISSUES COOL AIR IN HEAT MODE,
OR WARM AIR IN COOL MODE
• Check System Setting #03 (Reversing Valve), to make
sure it is properly configured for your system (see
page 11) .
HEAT/COOL BOTH ON AT SAME TIME
• Check SW1 (Equipment Type), to make sure it is set
to match the installed heating/cooling equipment
(see page 10) .
• Check to make sure heating and cooling wires are
not shorted together .
HEATING EQUIPMENT IS RUNNING IN
COOL MODE
• Check SW1 (Equipment Type), to make sure it is set
to match the installed heating/cooling equipment
(see page 10) .
"HEATING" IS NOT DISPLAYED
• Change the System Mode to Heat, and set
the temperature level above the current room
temperature .
"COOLING" IS NOT DISPLAYED
• Change the System Mode to Cool, and set
the temperature level below the current room
temperature .
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