4–37
T-368
AL59
HEATER TERMINATION THERMOSTAT (HTT)
Cause:
Heat Termination Thermostat (HTT) is open.
Component
Alarm 59 is triggered by the opening of the Heat Termination Thermostat
(HTT) and will result in the disabling of the heater.
Troubleshooting
Check for 24 volts at test point TP10, if no voltage at TP10 after unit has
reached set point HTT is open.
Corrective Action
Replace HTT if defective.
AL60
DEFROST TEMPERATURE SENSOR (DTS)
Cause:
Failure of the Defrost Temperature Sensor (DTS) to open.
Component
Defrost Temperature Sensor (DTS)
Troubleshooting
Test the DTS; refer to Sensor Checkout Procedure
.
Corrective Action
Replace the DTS if defective, refer to Sensor Replacement
AL61
HEATER CURRENT DRAW FAULT
Cause:
Improper current draw during heat or defrost mode.
Component
Heater(s)
Troubleshooting
While in heat or defrost mode, check for proper current draw at heater con-
tactors, refer to Electrical Data
.
Corrective Action
Replace heater(s) if defective, refer to
Evaporator Heater Re-
moval and Replacement.
Component
Contactor
Troubleshooting
Check voltage at heater contactor on the heater side. If no voltage present:
Corrective Action
Replace heater contact or if defective.
AL63
CURRENT LIMIT
Cause:
Unit operating above current limit.
Component
Refrigeration System
Troubleshooting
Check unit for air flow restrictions.
Corrective Action
Clean or remove any debris from coils.
Component
Refrigeration System
Troubleshooting
Check unit for proper operation.
Corrective Action
Repair as needed.
Downloaded from
Summary of Contents for 69NT40-541-505
Page 2: ...Downloaded from ManualsNet com search engine...
Page 4: ...Downloaded from ManualsNet com search engine...
Page 10: ...Downloaded from ManualsNet com search engine...
Page 14: ...Downloaded from ManualsNet com search engine...
Page 18: ...Downloaded from ManualsNet com search engine...
Page 80: ...Downloaded from ManualsNet com search engine...
Page 86: ...Downloaded from ManualsNet com search engine...
Page 92: ...Downloaded from ManualsNet com search engine...
Page 124: ...Downloaded from ManualsNet com search engine...
Page 125: ...Downloaded from ManualsNet com search engine...
Page 126: ...Downloaded from ManualsNet com search engine...
Page 142: ...Downloaded from ManualsNet com search engine...