Troubleshooting
Error Location Type Description
Cause Solution
Hose portion
exposed to an
excessive heat
source, like hot
sun or coiled
hose, can pass
fluid more than
27°F (15°C) over
hose temperat ure
settingtotheFTS.
Shade exposed hose from
hot sun or expose FTS to
same en vironment when
at rest. Uncoil entire hose
before heating to av oi d
self-heating.
T4DH Hose High Temperature
Hose
Setting the A or
B setpoint much
higher than hose
setpoint can cause
fluid more than
27°F (15°C) over
hose temperat ure
settingtoreachthe
FTS.
Increase hose setpoint
so it is closer to A and B
setpoints.
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
canbeclearedwhenthe
heater temperature fa lls
below 190°F (87°C).
Disconnected
or loose
overtemperature
switch
cable/connection.
If heater is not actually
over tem perature, check
all wiring and connections
between th e TCM and the
overtemperature switches.
T4EA Heater A Hi gh Temperature
Switch A
Overtemperature
switch failed in the
open position.
Replace overtemperature
switch.
28 333024F
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