Troubleshooting
Error Location Type Description
Cause Solution
Overtemperature
switch sensed a
fluid temperature
above 230 °F
(110°C).
Heater was delivered too
much power, caus ing the
overtemperature switch to
open. RTD is not reading
properly. After the heater
cools down, replace RTD.
Switch closes and the error
canbeclearedwhenthe
heater temperature falls
below 190°F (87°C).
Disconnected
or loose
overtemperature
switch
cable/connection.
If heater is not actually
over temperature, check
all wiring and connections
between the TCM and the
overtemperature switches.
T4EB Heater B High Temperature
Switch B
Overtemperature
switch failed in the
open position.
Replace overtemperature
switch.
Cooling fan is not
operating properly.
Check to see that the motor
fan is moving. Measure
voltagetofan.Thereshould
be24VDC.
If no voltage is measured,
check fan wiring. If the
fan has volta ge b ut is no t
moving, replace fan.
If necessary use an air hose
to blow out around the fan
housings and remove any
built-up deb ris.
Disconnected
or loose motor
temperature cable.
Verify wiring b etwe en th e
motor temperature sensor
and the MCM.
High ambient
temperature.
Ensure ambient
tempera ture is below
120°F(48°C) b efore us in g
the system.
T4NM MCM High Temperature
Motor
Bad ele ctric motor. Repla ce electric motor.
Disconnected or
loose RTD c able or
connection.
Check all wiring and
connection to RTD.
T6DA Heater A Sensor Error A
Bad RTD.
Switch the RTD with
another and see if the error
messagefollowstheRTD.
Replace RTD if the error
follows the RTD.
333024F 29
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