Instructions / Assembly

SERVICING
79
Diagnostic/Status LED Codes
ComfortNet™
Thermostat Only
Symptoms of Abnormal Operation
(Legacy & ComfortNet Thermos tat)
Green Yellow Red Red Y1
Fa ult
Description
Message Code
Possible Causes
Corrective Actions Notes & Cautions
Four consecutive compressor protector
trips with average run time between
trips greater than 1 minute and less tha n
15 minutes.
Low pressure and high pressure
switches are closed.
Integrated control module
diagnostic/status LED’s display the
indicated code.
OFF 2
Flashes
OFF ON if call
present;
OFF if no
call
High Side Fault HIGH SIDE
FAULT
02 Blocked condenser coil.
Outdoor fan not running.
Check and clean
condenser coil.
Check outdoor fan
motor; repair/replace
as needed.
Check outdoor fan
motor wiring;
repair/replace as
needed.
Check outdoor fan
motor capacit or;
replace as needed.
Turn power OFF prior
to repair.
Fault will clear after 4
consecutive normal
cycles.
Fault may be cleared by
cycling 24VAC to
control.
Replace with correct
replacement part(s).
Compressor and outdoor fan are off.
Thermostat demand is present.
Integrated control module
diagnostic/status LED’s display the
indicated code.
ON 2
Flashes
OFF ON if call
present;
OFF if no
call
High Pressure
CO Trip
HPS OPEN 02
Blocked condenser coil.
Outdoor fan not running.
Check and clean
condenser coil.
Check outdoor fan
motor; repair/replace
as needed.
Check outdoor fan
motor wiring;
repair/replace as
needed.
Check outdoor fan
motor capacit or;
replace as needed.
Turn power OFF prior
to repair.
Replace with correct
replacement part(s).
Compressor and outdoor fan are off.
Low pressure switch trip 3 times within
same thermostat demand.
Thermostat demand is present.
Integrated control module
diagnostic/status LED’s display the
indicated code.
ComfortNetthermostat “Call for
Service icon illuminated.
ComfortNet™ thermostat scrolls
Check Air Conditioner or Check
Heat Pump” message.
ON 2
Flashes
ON ON if call
present;
OFF if no
call
HPCO Lockout
(3 Trips)
HP S
LOCK O UT
02 Blocked condenser coil.
Outdoor fan not running.
Check and clean
condenser coil.
Check outdoor fan
motor; repair/replace
as needed.
Check outdoor fan
motor wiring;
repair/replace as
needed.
Check outdoor fan
motor capacit or;
replace as needed.
Turn power OFF prior
to repair.
Must clear fault by
cycling 24VAC to
control.
Replace with correct
replacement part(s).
Run time for last 4 cycles is less than 3
minutes each.
Compressor protector has not tripped.
Low pressure and high pressure
switches are closed.
Integrated control module
diagnostic/status LED’s display the
indicated code.
OFF 3
Flashes
OFF ON if call
present;
OFF if no
call
Short Cycling CMPR SHRT
CYCLE
03 Intermittent thermostat
demand.
Faulty compressor relay.
Check thermostat and
thermostat wiring;
repair/replace as
needed.
Check compressor
relay operation;
replace control as
needed.
Turn power OFF prior
to repair.
Fault will clear after 4
consecutive normal
cycles.
Fault may be cleared by
cycling 24VAC to
control.
Replace with correct
replacement part(s).