Error
Location
Type
Description
Cause
Solution
Overtemperature
switch sensed a
fluid temperature
above 230°F
(110°C).
Heater was delivered too
much power, causing the
overtemperature switch to
open. RTD is not reading
properly. After the heater
cools down, replace RTD.
Switch closes and the error
can be cleared when the
heater temperature falls
below 190°F (87°C).
Broken 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
voltage to fan. There should
be 24 VDC.
If no voltage is measured,
check fan wiring.If the
fan has voltage but is not
moving, replace fan.
If necessary use an air hose
to blow out around the fan
housings and remove any
built-up debris.
Broken or loose
motor temperature
cable.
Verify wiring between the
motor temperature sensor
and the MCM.
High ambient
temperature.
Ensure ambient
temperature is below
120°F(48°C) before using
the system.
T4NM
MCM
High Temperature
Motor
Bad electric motor. Replace electric motor.
Broken or loose
RTD cable 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
message follows the RTD.
Replace RTD if the error
follows the RTD.
333024A
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