Troubleshooting; Error Codes; Thermostat Features - Aprilaire 8910W Safety & Installation Instructions

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 .

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 .
22 English
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 .
TROUBLESHOOTING
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 11) .

ERROR CODES

If the thermostat enters an error mode, all outputs are turned off . The thermostat attempts to recover every 10 minutes .
Error code Message
01
"SENSOR ERROR"
02
03 "EEPROM ERROR"
05 "LOST SYSTEM CONNECTION"
06
"REMOTE SENSOR ERROR"
07

THERMOSTAT FEATURES

• Remote access and control over Wi-Fi .
• Indoor air quality control .
– Humidification automatic or manual control .
– Dehumidification .
– Event-Based air cleaning .
™
– Ventilation with temperature and humidity limits .
• Temperature control .
• Heat Blast raises the room temperature 3°F to 5°F .
®
• Support for optional wireless outdoor temperature
sensor .
• Large touch screen with adjustable backlight –
constant backlight option available .
• Message center provides feedback and instructions .
"HEATING" IS NOT DISPLAYED
• Check Installer System Setting 04 (Control Setup) is
set correctly .
• Change the System Mode to Heat, and set
the temperature level above the current room
temperature .
"COOLING" IS NOT DISPLAYED
• Check Installer System Setting 04 (Control Setup) is
set correctly .
• Change the System Mode to Cool, and set
the temperature level below the current room
temperature .
Error Description
Open temperature sensor circuit
Shorted temperature sensor circuit
Error in permanent memory
Thermostat lost connection to equipment interface module
Open remote temperature sensor circuit
Shorted remote temperature sensor circuit
• 7 day programmability .
• Displays room temperature, room humidity,
temperature setting, and optional outdoor temperature .
• Air filter, humidifier, dehumidifier, and HVAC service
reminders .
• Programmable fan control with fan circulation mode .
• Easy to use temperature control can override program
schedule at any time .
• Progressive recovery ensures proper temperature at
the start of a program event .
• Built in compressor protection prevents damage to
your equipment .
• System test mode .
English 23