Troubleshooting Chart - Carrier 50VZ Installation, Operation And Maintenance Instructions

TROUBLESHOOTING CHART

A list of possible faults, as well as the probable cause and suggested solutions is shown in Table 12. In the event of a unit
malfunction it is recommended to disconnect the power supply and ascertain the cause.
Symptoms
Unit does not start
Unit starts and stops frequently
Unit continuously cuts out at
low pressure
Unit continuously cuts out at
high pressure
Abnormal system noise
Compressor loses oil
Water loss
Order No. 15021-20, 11.2000. Supersedes order No.: New
Manufacturer reserves the right to change any product specifications without notice.
Table 12 - Troubleshooting chart
Cause
No power supply
Main switch open
Low line voltage
A protection has tripped
Contactor stuck open
Seized compressor
Defective compressor contactor
Defective compressor
Refrigerant losses
Defective low pressurestat
Refrigerant losses
Indoor fan does not operate
COOLING CYCLE:
Defective high pressurestat
Blocked filter drier
Outdoor fan does not operate
HEATING CYCLE:
Defective high pressurestat
Indoor fan does not operate
Piping vibration
Noisy compressor
Badly fitting panels
Leak in system
Defective drainage connections
Remedy
Connect power supply
Close switch
Check voltage and remedy the deficiency
Reset
Replace contactor
Replace compressor
Replace contactor
Replace compressor
Reclaim the charge, pull a vacuum, recharge
the system with the quantity indicated on the
name plate
Replace pressurestat
Check and add the necessary quantity
Check fan motor
Replace pressurestat
Replace filter
Check fan motor
Replace pressurestat
Check fan motor
Support piping
Check and change if necessary
Install correctly
Repair leak
Check and tighten if necessary
Printed on Totally Chlorine-Free Paper.
Printed in the Netherlands
AM-036918