Page 17
XP17
Heat Pump Control
LEDs
Clearing Sta
tus
Solution
Possible
Cause(s)
Condition
iComfortt
-enabled
Thermostat
Display
DS15
Yellow
Clearing Sta
tus
Solution
Possible
Cause(s)
Condition
iComfortt
-enabled
Thermostat
Display
DS13
Red
1 flash
then
pause
Off
Critical Alert
Code 401
Long run
time.
Compressor is
running extreme
ly long run
cycles.
1
Low refrigerant charge.
2
Evaporator blower is not running.
Check blower relay coil and contacts
Check blower motor capacitor
Check blower motor for failure or blockage
Check evaporator blower wiring and connec
tors
Check indoor blower control
Check thermostat wiring for open circuit
3
Evaporator coil is frozen.
Check for low suction pressure
Check for excessively low thermostat setting
Check evaporator airflow (coil blockages or re
turn air filter)
Check ductwork or registers for blockage.
4
Faulty metering device.
Check TXV bulb installation (size, location and
contact)
Check if TXV/fixed orifice is stuck closed or de
fective
5
Condenser coil is dirty
.
6
Liquid line restriction (filter drier blocked if pres
ent)
.
7
Thermostat is malfunctioning
.
Check thermostat sub-base or wiring for short
circuit
Check thermostat installation (location and
level)
Clears the error
after 30 consec
utive normal run
cycles, or after
power reset.
2 flashes
then
pause
Off
Critical Alert
Code 402
System
pressure trip
Indicates the
compressor
protector is open
or missing supply
power to the
compressor.
1
High head pressure.
Check high pressure switch if present in sys
tem
Check if system is overcharged with refriger
ant
Check for non-condensable in system
2
Condenser coil poor air circulation (dirty,
blocked, damaged).
3
Condenser fan is not running.
Check fan capacitor
Check fan wiring and connectors
Check fan motor for failure or blockage
4
Return air duct has substantial leakage.
Clears after four
consecutive
normal com
pressor run
cycles, or after
power reset.
3 flashes
then
pause
Off
Moderate
Alert Code
403
Short cycling
Compressor is
running less than
three minutes.
1
Thermostat demand signal is intermittent.
2
Time delay relay or heat pump control is defec
tive.
3
If high pressure switch is present, see flash code
2 information.
Clears after four
consecutive
normal com
pressor run
cycles, or after
power reset.
4 flashes
then
pause
Off
Critical Alert
Code 404
Locked rotor
Compressor has
a locked out due
to run capacitor
short, bearings
are seized,
excessive liquid
refrigerant.
1
Run capacitor has failed.
2
Low line voltage (contact utility if voltage at
disconnect is low).
Check wiring connections
3
Excessive liquid refrigerant in the compressor.
4
Compressor bearings are seized.
Clears after
power reset or
four normal
compressor
cycles.
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