Cincinnati Sub-Zero WarmAir 135 - Page 28

WarmAir

Model 135 Manual TROUBLESHOOTING
Page 28 of 43
Problem
Possible Cause
Action
The Warming Unit heats up but
then shuts off before reaching
temperature.
Thermostat (heater/blower
housing) maybe out of
calibration.
Allow unit to cool from possible
over-heat condition. If
condition persists, check
continuity of each thermostat.
Replace if necessary.
Faulty Control Board
Consult with authorized CSZ
representative or replace
board.
Faulty Thermistor.
Check resistance value of each
leg (White/Gray & Red/Green)
at room temperature.
18C/65F  3081
21C/70F  2690
24C/75F  2354
Replace sensor if necessary.
Obstructed Filter or Blower
wheel.
Verify unit has adequate air
flow. Replace filter if necessary.
Remove top cover and
thermistor. Remove hose and
verify that blower wheel spins
freely.
The Warming Unit alarms at
too low or too high a
temperature.
Faulty Thermistor.
Check resistance value of each
leg (White/Gray & Red/Green)
at room temperature.
18C/65F  3081
21C/70F  2690
24C/75F  2354
Replace sensor if necessary.
Faulty Control Board.
Confirm unit is being used in
ambient between 15°C/59°F
and 30°C/86°F. Consult with
authorized CSZ representative
or replace board.