Isalsa, Troubleshooting chart-heating cycle – Carrier 50QQ User Manual
Page 16
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TROUBLESHOOTING CHART-HEATING CYCLE
POWEfI CinCU
SUPPLEMENTAL HEAT
RELAY ENERGIZED
OR WIRED WRONG
COMPRESSOR
POWER SUPPn
OPEN
FAULTY START CAP
OR RELAY ISINGLE
PHASEl OR PTC
INDOOR FANS
CYCLING ON
OVERLOAD
OVERCHARGE OR
NONCONDENSABLES
IN SYSTEM
RESTRICTED OR
STUCK
METERING DEVICE
LOW LINE VOLTAGE
OH UNBALANCED
1 PHASF LINE
DEFFI IIVF HUN
(,APA
î
:HOH
iSINLiie PHASF I
REVERSING VALVE
JAMMED IN MID
POSITION
LOOSE LEADS A
OUTDOOR FAN
MOTOR
DEFROST BOARO
NC CONTACTS
OPEN
METERING DEVICE
RESTRICTED OR
ICE CLOGGED
UNDERCHARGED
DEFROST T STAT
IN POOR PHYSICAL
CONTACT WITH LINE
DEFECTIVE DEFROST
RELAY OR DEFROST
TIMER
BAD ELECTRICAL CON
NECTION ANYWHERE
IN DEFROST CIRCUIT
OUTDOOR
THERMOSTAT
DEFECTIVE
CAP TUBE PINCHED
OR BULB NOT
SENSING TRUE OOT
STRIP HEATER RELAY
OR CONTACTOR
DEFECTIVE
OPENING IN POWER
CIRCUIT TO HEATER
ELEMENTS
OPEN (KLIXONI
OVERTEMPERATURE
THERMOSTAT
DEFECTIVE ROOM
THERMOSTAT
I2ND STAGE)
TROUBLESHOOTING CHART—COOLING CYCLE
NO COOLING OR
INSUFFICIENT COOLING
COMPRESSOR
WILL NOT RUN
CONTACTOR OPEN
OPENING IN
POWER CIRCUIT
DEFECTIVE LOW
VOLTAGE
TRANSFORMER
CONTACTOR OR
COIL DEFECTIVE
INTERNAL OVERLOAD
OPEN
CONTACTOR CLOSED
FAULTY START CAP
OR RELAY (SINGLE
PHASE) OR PTC
COMPRESSOR STUCK
COMPRESSOR RUNS
BUT CYCLES ON 8i OFF
INTERNAL OVERLOAD
OUTDOOR FAN STOPPED
OR CYCLING ON
OVERLOAD
LOOSE LEAD AT
FAN MOTOR
DEFROST BOARD
N C CONTACTS
MOTOR DEFECTIVE
OUTDOOR AIR
RESTRICTED OR
RECIRCULATING
COMPRESSOR HOT
REVERSING VALVE
IN MID POSITION
LINE VOLTAGE
LOW LINE VOLTAGE
OR UNBALANCED
3 PHASE
DAMAGED
REVERSING
VALVE
RESTRICTED
DISCHARGE
LINE
OVERCHARGE OR
NONCONDENSABLES
IN SYSTEM
LOW
REFRIGERANT
CHARGE
DIRTY AIR FILTERS
DUCT RESTRICTED
COIL FROSTED
LIOUID LINE
SLIGHTLY
RESTRICTED
METERING DEVICE
RESTRICTED
COMPRESSOR RUNS
INSUFFICIENT COOLING
HIGH SUCTION
LOW HEAD
PRESSURE
REVERSING VALVE
HUNG UP OR
INTERNAL LEAK
DEFECTIVE
COMPRESSOR
VALVES
COMPRESSOR
FLOODING
UNIT
OVERCHARGED
INTERNAL
PRESSURE
RELIEF OPEN
RESTRICTED
OR STUCK
METERING DEVICE
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obiigations.
BookI 1 I 4
PC 101 Catalog No. 565-097
Printed in USA
Form 50QQ-8SI Pg 16
11-87
Replaces: 50QQ-7SI
Tab
Isalsa