Aprilaire 8830 Safety & Installation Instructions page 13

QUICK REFERENCE TO CONTROLS & DISPLAY
EQUIPMENT CONTROL MODULE LEDs
POWER/STATUS – On solid during normal operation . Flashes
when connection to the thermostat is lost and at power-up while
the thermostat connection is being established .
HEATING – On when heating outputs are active .
COOLING – On when cooling outputs are active .
FAN – On when fan output is active .
HUMIDIFIER – On when humidifier output is active .
DEHUMIDIFIER – On when dehumidifier output is active .
VENTILATION – On when ventilation output is active .
AIR CLEANING – On when air cleaner output is active .
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TROUBLESHOOTING
DISPLAY IS BLANK
If Power LED not illuminated at the equipment control
module check the following .
• Check circuit breaker and reset if necessary .
• Make sure power switch at heating & cooling
system is on .
• Make sure furnace door is closed securely .
HEATING SYSTEM DOES NOT RESPOND
("HEATING" APPEARS ON SCREEN)
• Check for 24VAC 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 24VAC between the heat terminal (W)
and the transformer common . If 24VAC 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 .
COOLING SYSTEM DOES NOT RESPOND
("COOLING" APPEARS ON SCREEN)
• Check for 24VAC 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 24VAC between the cooling terminal (Y)
and the transformer common . If 24VAC 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 .
HEAT PUMP ISSUES COOL AIR IN HEAT MODE,
OR WARM AIR IN COOL MODE
• Check wiring at the terminal block to confirm the
reversing valve is connected to the proper terminal .
O is active in cooling and B is active in heating .
HEAT/COOL BOTH ON AT SAME TIME
• Check SW1 (Equipment Type), to make sure it is set
to match the installed heating/cooling equipment .
• 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 13) .
"HEATING" IS NOT DISPLAYED
• Change the System Mode to Heat, and set
the temperature level above the current room
temperature .
• If Heat is not a system mode option, check Installer
System Setting 04 (Control Setup) is set correctly .
"COOLING" IS NOT DISPLAYED
• Change the System Mode to Cool, and set
the temperature level below the current room
temperature .
• If Cool is not a system mode option, check Installer
System Setting 04 (Control Setup) is set correctly .
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