12 trouble-shooting – Pfannenberg DTS Air Conditioner User Manual
Page 11

Operating and Installation Instructions DTS Air Conditioner
08.2001
085 408 022
11
12 Trouble-Shooting
If the Air Conditioner should require service, we have compiled a trouble-shooting chart to assist your
service personnel. If additional assistance is required please contact Pfannenberg Inc.
Problem Possible
Cause(s)
Solution
Unit not cooling
No Power
Check Power Source and
Electrical Connections
Loss of Refrigerant
Locate and repair leak
Evaporator or Condenser Fan
not operating
Replace motor, Capacitor or
entire Assembly
Filter clogged
Clean or replace Filter
Dirty Evaporator or Condenser
Clean Device
Thermostat improperly set
Lower setting until unit starts
Thermostat defective
Replace Thermostat or Relay
Failed Compressor
Replaced Compressor
Ice on Evaporator Coil
Insufficent Heat Load or Unit
Oversized for Application
Contact Pfannenberg Inc.
Failed Evaporator Fan
Replace Evaporator Fan Motor
or Assembly
Dirty Evaporator
Clean Device
Condensate draining
continuously
Enclosure not properly sealed
Check and seal all openings
Excessive opening of Enclosure
Eliminate the frequency of door
opening
Thermostat improperly set
Setting on 35°C / 95°F
Condensate fails to drain
off
Malfunction on condensate
overflow
Clean overflow and/or check that
hose is connected without kinks
Excessive vibration
Defective Fan
Replace Fan
Compressor Loose
Tighten Mounting Bolts
Compreesor Inoperative
Low line Voltage
Check Nameplate Voltage
Loss of Compressor Oil
Replace Compressor
Loss of Refrigerant
Locate and repair leak
Failed Compressor Capacitor
Replace Capacitor
Thermal Overload
Contact Pfannenberg Inc.
Power interruptions
Allow Compressor time to reset
Refrigerant or Oil leaks
Crack or pin hole in tubing or
brazed joints
Replace tubing or rebraze joint