Armstrong Air 4SCU 16LS Series, Installation And Maintenance Instructions Manual

Page: 21 / 32

506859-01 Issue 1236 Page 21 of 32
Alert
Codes
P riority Alarm Description P ossible Causes and Clearing Alarm
E 105 Critical
T he outdoor unit has lost
com m unication with the rest of the
system .
E quipm ent is unable to com m unicate. T his m ay indicate the existence of other alarm s / codes. In m ost
cases errors are related to electrical noise. M ake sure high voltage power is separated from RS B us.Check
for m is-wired and/or loose connections between the stat, indoor unit and outdoor unit. Check for a high
voltage source of noise close to the system . T his is a self
− recoverable error.
E 120 M oderate
T here is a delay in the outdoor unit
responding to the system .
T ypically, this alarm /code does not cause any issues and will clear on its own. T he alarm / code is usually
caused by a delay in the outdoor unit responding to the therm ostat. Check all wiring connections. Cleared
after unresponsive device responds to any inquiry
E 124 Critical
T he Com fort S ync therm ostat has
lost com m unication with the outdoor
unit for m ore than 3 m inutes. E quipm ent lost com m unication with the therm ostat. Check the wiring connections, ohm wires and
cycle power. T he alarm stops all associated HV A C operations and waits for a heartbeat m essage from the
unit that’s not com m unicating. T he alarm / fault clears after com m unication is re
− established.
E 125 Critical
T here is a hardware problem with the
outdoor unit control. T here is a control hardware problem . Replace the outdoor control if the problem prevents operation
and is persistent. T he alarm / fault is cleared 300 seconds after the fault recovers
E 126 Critical
T here is an internal com m unication
problem with the outdoor unit control. T here is an internal hardware problem on the control. T ypically the control will re − set itself. Replace the
control if the problem prevents operation and is persistent. T he alarm / fault is cleared 300 seconds
after the fault recovers.
E 131 Critical
T he outdoor unit control param eters are
corrupted Reconfigure the system . Replace the control if heating or cooling is not available
E 180 Critical
T he Com fort S ync therm ostat has
found a problem with the outdoor unit’s
am bient sensor. In norm al operation after outdoor control recognizes sensors, the alarm will be sent if valid
tem perature reading is lost. Com pare outdoor sensor resistance to tem perature/resistance charts in
unit installation instructions. Replace sensor pack if necessary. A t the beginning of (any)
configuration, furnace or air
− handler control will detect the presence of the sensor(s). If detected
(reading in range), appropriate feature will be set as ’installed’ and shown in the Com fort S ync
’A bout’ screen. T he alarm / fault will clear upon configuration, or sensing norm al values.
E 409 M oderate
T he secondary voltage for the outdoor
unit has fallen below 18V A C. If this
continues for 10 m inutes, the system will
shut down. S econdary voltage is below 18V A C. A fter 10 m inutes, operation is discontinued. Check the indoor line
voltage, transform er output voltage. T he alarm clears after the voltage is higher than 20V A C for 2 seconds
or after a power reset.
E 410 M oderate
T he outdoor unit pressure is below the
required lim it. Unit pressure is below the lower lim it. T he system is shutdown. T he low pressure switch for
HFC
− 410A will open at 40P S IG and close at 90P S IG . Confirm that the system is properly charged with
refrigerant. Check T X V , indoor unit blower m otor, dirty filters or clogged refrigerant filter. Confirm that
the evaporator coil is clean. T he alarm clears after the pressure switch closes or after a power reset
E 411 Critical
T he low pressure switch has opened 5
tim es during one cooling cycle. A s a
result, the system will shutdown. O pen low pressure switch error count reached 5 strikes. T he low pressure switch for R410A will open at
40P S IG and close at 90P S IG . Confirm that the system is properly charged with refrigerant. Check T X V ,
indoor unit blower m otor, dirty filters or clogged refrigerant filter. Confirm that the evaporator coil is clean.
T he alarm clears after a power reset
E 412 M oderate
T he outdoor unit pressure is above the
required lim it. T he system will shut
down. Unit pressure is above the upper lim it. S ystem is shut down. T he high pressure switch for HFC − 410A
will open at 590P S IG and close at 418P S IG . Confirm that the system is properly charged with
refrigerant. Check condenser fan m otor, T X V , indoor unit blower m otor, stuck reversing valve or
clogged refrigerant filter. Confirm that the outdoor unit is clean. T he alarm clears after 4 consecutive
norm al com pressor run cycles, the pressure switch closes or a power reset
E 413 Critical
T he high pressure switch has opened 5
tim es during one cooling cycle. A s a
result, the Com fort S ync therm ostat
will shutdown. O pen high pressure switch error count reached 5 strikes. S ystem is shut down. T he high pressure
switch for HFC
− 410A will open at 590P S IG and close at 418P S IG . Confirm that the system is properly
charged with refrigerant. Check condenser fan m otor, T X V , indoor unit blower m otor, stuck reversing
valve or clogged refrigerant filter. Confirm that the outdoor unit is clean. T he alarm clears after a power
reset.
E 414 M oderate
T he discharge line tem perature is higher
than the recom m ended upper lim it of
279ºF. Discharge line tem perature is > 279ºF. Confirm that the system is properly charged with refrigerant.
Check system operating pressures and com pare to unit charging charts in installation m anual. Confirm
that the outdoor unit is clean. T he alarm clears after the discharge tem perature is < 225ºF.
E 415 Critical
T he discharge line tem perature has
been consistently higher than the
recom m ended upper lim it of 279ºF. Discharge line high tem perature error count reached 5 strikes. Confirm that the system is properly
charged with refrigerant. Check system operating pressures and com pare to unit charging charts in
installation m anual. Confirm that the outdoor unit is clean. T he alarm clears after the discharge
tem perature is < 225ºF. T he alarm clears after a power reset.
NO T E - S ystem fault and lockout seven - segm ent display alarm codes takes precedence over system status codes
(cooling, heating stages or defrost/dehum idification). O nly the latest active fault or lockout alarm code if present will be displayed. If no fault or lockout codes are active, then
system status are routinely displayed.
Table 9
Seven-Segment Display Alert Codes