Filter
Top Products
Troubleshootin
g
Error
Code
Error
Position
Type Name
Cause Solution
Cooling fan no
t operating.
If fan is not wo
rking check
wiring betwee
nCB03and
fan. If wiring
is good, replace
fan.
T4CA
T4CB
T4CH
Boost A
Boost B
Hose
ALARM
(T4CA or T4CB)
LPTCM Over
Temperature
(T4CH) HPTCM
Over Temperature
Overheated module. Turn controller off. Wait
a few minutes. If the
condition does not clear or
regenerates consistently,
replace module.
High ambient
temperature.
Ensure ambient temperature
is below 120°F(48°C) before
using the system.
T4CM MCM
ALARM
High MCM
Temperature
Overheated control
module.
Stop the pumps. Wait
a few minutes. If the
condition does not clear or
regenerates consistently,
replace MCM. See System
Repair manual.
Bad RTD or bad RTD
placement against heater
rod.
Swap A an
d B heater volex
cables a
nd RTD cables and
see if is
sue follows. If so,
replac
eRTD.
T4DA
T4DB
Boost A
Boost B
ALARM
High Che
mical
Tempera
ture
Bad Low
Power
Temper
ature Control
Module
.
Swap the A and B LPTCMs
and see if the issue follows
the module. If so replace
LPTCM. See system repair
manual.
Broken Fan.
Check fan relay (K4) and
fuse (30 Amp ATO “F3”) on
load center board. Replace
if needed.
Plugged radiator.
Rep
lace if needed.
T4DE Heat
Exchanger
ALARM High Temperature
Coolant Outlet
High ambient
temperature.
Ensure ambient temperature
is below 120°F(48°C) before
using the system.
3A1705J 83