Troubleshooting - American Standard AccuLink Platinum 1050 Installation Manual

10. Troubleshooting

SYMPTOM
1050 Control displays an alert on
the screen.
Display will not come on
Indoor temperature display is
incorrect.
Indoor humidity display is incor-
rect.
Room temperature overshoots
when the Heat/Cool setting is
changed more than 2°.
Heating will not come on.
Cooling will not come on.
Heating or Cooling is displayed,
but no warm or cool air is coming
from the registers.
Fan runs all the time
"+" symbol appears on Home
Screen beneath Indoor
Temperature readout
Fan is set to ON but not running.
Cooling or Heating cycles too
fast or too slow (narrow or wide
temperature swings).
Heat pump is not turning on; only
furnace or electric heat strips are
running.
11-HD15D1-5-EN
POSSIBLE CAUSES
A critical or major alert is present.
Loss of 24VAC between R & B at the 1050
Control.
1) Indoor temperature display needs calibration.
2) Surrounding air flow affecting sensed
temperature of the 1050 Control
Indoor humidity display needs calibration.
1) Oversized heating/cooling equipment under
current conditions. 1050 Control cannot re-
spond fast enough to prevent overshooting.
2) Improper location of 1050 Control.
1) System mode is not set to Heat/Auto or set-
point is set too low.
2) Minimum off time delay is being enforced.
3) Heating system may require service.
1) System mode is not set to Cool/Auto or the
setpoint is too high.
2) Minimum off time delay is being enforced.
3) Cooling system may require service.
1) There is a fan delay as the heating or cooling
equipment turns on.
2) Equipment is not working properly.
1) Fan mode is set to On, Circulate or Clean
mode
2) There is a failure in the indoor unit
Both compressor heat and indoor heat are being
called simultaneously
1) Smart Continuous Fan feature has been is
engaged.
2) Blower motor is not functioning.
1) Check the location of the 1050 Control for
drafts.
2) Cycles per hour or aggressive recovery is
improperly set.
1) Outdoor temperature is below compressor
lockout temperature setting.
2) Compressor heating lockout is enabled and
outdoor temp sensor is out of calibration or
failed.
3) The outdoor unit is not reporting (Err.126.00)
ACTION
Navigate to the Diagnostic screen on the 1050 Control
for a Problem Description and Possible Cause.
1) Check wiring between R & B
2) Check transformer for 24VAC output.
3) Check for broken or shorted thermostat wire.
Calibrate temperature sensor from 1050 Control's
menu.
Calibrate humidity sensor from the 1050 Control's
menu.
1) Compare heat load calculation to equipment chosen.
2) Relocate 1050 Control (or use remote sensor)
1) Set mode to heat and raise the setpoint above the
room temperature.
2) Wait for 5 minutes and recheck heating equipment.
3) Check/repair system.
1) Set mode to cool and lower the setpoint below the
room temperature.
2) Wait for 5 minutes and recheck cooling equipment.
3) Check/repair system.
1) Wait a minute for blower delays and recheck regis-
ters.
2) Check/repair system.
1) Check 1050 Control settings to see if fan is set to
On, Circulate or Clean mode.
2) Check indoor unit for failures (such as tripped heat-
ing limit).
No action required, symbol is for informational purposes
only
1) If indoor humidity is higher than desired setpoint,
the blower will cycle off with the equipment. A humidity
icon will be displayed on the Fan Mode button when
the blower operation is being inhibited due too high
humidity.
2) Check/repair system.
1) Seal air leaks behind 1050 Control. Relocate 1050
Control or apply remote indoor temperature sensor.
2) Adjust cycle rates and aggressive recovery features
in the advanced installer set up.
1) Adjust the compressor lockout temperature setting
if desired.
2) Check/repair outdoor sensor or wiring.
3) Check communication status of outdoor unit.
Platinum 1050
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