Cincinnati Sub-Zero WarmAir 135 - Troubleshooting Common Problems

WarmAir

Model 135 Manual TROUBLESHOOTING
Page 27 of 43
Troubleshooting
Call CSZ Medical Technical Support for Replacement Parts. If you wish to return the unit to CSZ for
examination and repair, please refer to the following section. In Europe contact our authorized
representative.
Problem
Possible Cause
Action
The Warming Unit does not
turn on.
Unplugged or damaged power
cord.
Make sure power cord is
plugged in and is undamaged.
Replace cord if necessary.
No power to outlet.
Confirm power to outlet.
Check circuit breaker power
switch.
Reset power switch (turn power
switch to off position then back
to the on position).
Poor or loose wire connections.
Ensure all connectors and
terminals are secure.
Ensure power cord and the base
wire harness are properly
attached to terminal block.
Safety Thermostat(s) open.
Allow unit to cool from possible
over-heat condition. If condition
persists, check continuity of
each thermostat. Replace if
necessary.
The Warming Unit blows air
but does not heat.
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.
Loose heater connection.
Verify heater header/terminals
are secure on the control board
(J4) as well as the main
connector (J10/P10).
Faulty Heater.
Check the heater wires
resistance (approx. 12). If
open, replace heater.
Faulty control board.
Consult with authorized CSZ
representative or replace board.