Graco 3A1705J - page 82

Troubleshooting
Error
Code
Error
Position
Type Name Cause Solution
Flowis to o high at current
setpoint.
Use a smaller mix chamber
that is rated for the unit in
use.
T2DA
T2DB
Boost A
Boost B
ALARM Low Chemical
Temperature
Bad heater(s)Confirm resistanceo f heater
is 23–26.5 ohms. Replace if
OL/open loop.
T2DH Hose ALARM Low Chemical
Temperature
Cold chemical in
unheated portion of
systempassed hose FTS
at startup.
Recirculateheated chemical
back to drum in cold
conditions beforestartup.
Radiator fan will not stop. Replace fan relay. See
system repair manual.
T2DE Heat
Exchanger
ADVISORY Low Temperature
Coolant Outlet
Engine thermostat is
stuck open.
Replace thermostat. See
Perkins distributor to
replace.
T3NM MCM ADVISORY High Motor
Temperature
Motor is operating
outside of pressure
flow curve. The system
is running at a lower
setpointtopreserve
motor life.
Run the system at a
lower duty cycle or with a
smaller mix chamber. See
Performance Charts, page
99.
Manualvalve switch (MV)
on load center board is in
the ON position.
Open cabinetcover and turn
switch to the OFF position.
A or B side control valve
solenoid is stuck in the
open position. Debris
in valve diaphragm
or plunger preventing
spring-loaded closed
function.
Disconnect connector
from valve solenoid coil.
If temperature does not
decrease, rebuild solenoid.
Shortonloadcenter
board. If the blue and red
LEDsareonwhilethe
heat is off, then the load
center board is bad.
See Load Center
Diagnostics in the system
repair manual.
(T4BE only) J6 connector
on load center “Heat
Valves” location is not
centered.
Reconnect J6 connector
on load center in centered
location.
T4AE
T4BE
Heat
Exchanger
ALARM High Chemical
Temperature Hx A
(T4AE)
High Chemical
Temperature Hx B
(T4BE)
Aand B heat
exchanger RTD cables
cross-connected to
splitter cable.
See System Repair Manual
for correct connection.
82 3A1705J