Carrier 38AQ Specifications download pdf (Page 28)

TROUBLESHOOTING CHART-- HEATING CYCLE

Do

I

CONTACTOR

OPEN

CIRCUIT F

BREAKER

OPEN

1

POWER CIRCUIT

DEFECTIVE LOW-

VOLTAGE

TRANSFORMER

t

COMPRESSOR 1

WILLNOTRUN

I

1

CONTROLRELAY

COILORCONTACTS

DEFECTIVE

_,_ REVERSING

VALVE RELAY

DEFECTIVE

._ CONTACTOR

COIL

DEFECTIVE

COMPRESSOR

CYCLE=LOC TM

CIRCUIT

I

I

LOSS-OF_CHARGE I

SWITCH CYCUNG

DISCHALGE GAS I

TH_ _cMLIONS_AT I

-_ CCH DEFECTIVE 1

___ OIL PRESSURE

SWITCH OPEN

I

._ CONTACTOR

CLOSED

._ COMPRESSOR

SEIZED

i[ CIRCUIT

BREAKER

OPEN

1

I COMPRESSOR

RUNSBUT

CYCLESOFF

I

I NO HEATING OR

INSUFFICIENT

HEATING

I

I

I

COMPRESSOR

RUNS, tNSUPFt-

CIENTttEATING

I

I

__{HIGH-PRESSURE 1

SWITCH

____[ DIRTY FILTERS

OR

INDOOR COIL

__[ INDOOR FANS

CYCLING ON

OVERLOAD

_{ LOOSE LEADS

AT

FAN MOTOR

._ FAN MOTOR I

BURNED OUT

,._ DAMAGED I

REVERSING

VALVE

._ RESTRICTtONIN I

DISCHARGE LINE

I

DISCHARGE

GAS

THERMOSTAT

COMPRESSOR

VALVES

DEFECTIVE

LOW LINE 1

VOLTAGE OR UN

BALANCED

3-PHASE LINE

COMPR ESSO R

BEARINGS

I

LOW VAPOR

LOW HEAD

PRESSURE

I

OUTDOOR FAN

STOPPED

_[LOOSELEADSAT]

OUTDOOR FAN

MOTOR

HIGH LOAD 1 "_ PAN MOTOR

CONDITION BURNED OUT

I NONCONDEN I N.C. CONTACTS

SABLES

I

REVERSING

VALVE JAMMED

tN MID

POSITION

t

OUTDOOR FAN

RUNNING

UNDERCHARGED

SYMPTOMS

I

INDOOR COIL

HEADERCHECK

VALVESTUCK

OPEN

1

OUTDOORHEADER 1

CHECK VALVE

STUCK CLOSED

OUTDOOR COIL

DIRTY

OUTDOOR COIL

HEAVILY

FROSTED

...{ DEFROST

THERMOSTAT IN

POOR CONTACT

WITH LINE

_{ DEFECTIVE 1

DEFROST RELAY

OR TIMER

I

OP,v_jGsH/ VAP(_R A T

I

COMPRESSOR

FLOODING

HIGH VAPOR

LOW HEAD

PRESSURE

I

CHECK VALVE

(C)

OPEN

I

L LOW VAPOR

HIGit HEAD

PRESSURE

I

RESTRICTED ]

LIQUID LINE

OR STRAINER

1

METERING DEVICE

RESTRICTED OR

iCE CLOGGED

t

SYSTEM

OVERCHARGED

I

ou;_oo_C_EC_

RESTRICTED

LEGEND

CCH -- Crankcase Heater

N.C. -- Normally Closed

__.[ REVERSING

VALVE

STUCK

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