Rheem A17 Series - Page 44

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10.0 DIAGNOSTICS AND TROUBLESHOOTING
10.7 Service Analyzer Chart (cont.)
Diagnostics
COMPRESSOR OVERHEATING (Cont.)
SYMPTOM POSSIBLE CAUSE CHECK OR REMEDIES
Short cycling of
compressor (cont.)
Distributor tube Restricted with foreign matter
Kinked
I.D. reduced from previous compressor failure
Low charge Check system charge
Low evaporator airow Dirty coil
Dirty lter
Duct too small or restricted
Faulty run capacitor Replace capacitor
Faulty internal overload Replace compressor
Faulty compressor
Fast equalization/Low pressure difference Replace compressor and examine system to locate
reason
ELECTRICAL
SYMPTOM POSSIBLE CAUSE CHECK OR REMEDIES
Voltage present on
load side of com-
pressor contactor
and compressor
won’t run
Compressor starts components Check start capacitor
Check potential relay
Run capacitor Check with ohmmeter
Internal overload Allow time to rest
Compressor windings Check for correct ohms
Voltage present on
line side of com-
pressor contactor
only
Thermostat Check for control voltage to contactor coil
Compressor control circuit High-pressure switch
Low-pressure switch
Ambient thermostat
Solid-state protection control or internal thermal sensor
Compressor timed off/on control or interlock
No voltage on line
side of compressor
contactor
Blown fuses or tripped circuit breaker Check for short in wiring or unit
Improper wiring Recheck wiring diagram
Improper voltage
High voltage Wrong unit
Power supply problem
Low voltage Wrong unit
Power supply problem
Wiring undersized
Loose connections
FLOODED STARTS
SYMPTOM POSSIBLE CAUSE CHECK OR REMEDIES
Liquid in the com-
pressor shell
Faulty or missing crankcase heater Replace crankcase heater
Too much liquid in
system
Incorrect piping Check piping guidelines
Overcharge Check and adjust charge