Graco 3A1705J - page 81

Troubleshooting
Error
Code
Error
Position
Type Name Cause Solution
Recirculating material
to heat with drum feed
pumps only.
Recirculate material
using Jog mode for heat
exchanger heating.
Coolant circulationpump
not working.
Check for 240 VAC on
pump. If thereisthecorrect
voltage, replace circulation
pump. See system repair
manual.
Air lock in circulation
pump.
Check for coolant flow in
sight glass.
Loose or incorrect wiring
connections.
See wiring schematics, in
the system repair manual,
and verify coolant valve
connections. Check coolant
valve harness and verify
voltage is 11–13 volts at
coolant valve connectors.
T2AE
T2BE
Heat
Exchanger
DEVIATION Low Temperature
Hx A
Low Temperature
Hx B
No voltage to coil of
valve.
Turn on the manual valve
switch (MV), on the load
center (PE), to manually turn
on the solenoids and see if
the temperature rises. If not,
check voltage output on J6
connector on the load center
and ensure the LEDS are
on. See load center wiring
in system repair manual.
FollowLoadCenter
Diagnostics instructions
in system repair manual. If
necessary, replace the load
center board.
If voltage is present,
measure the resistance
of the coil, it should be
approximately 12.5 Ω, if coil
is open replace coil.
If voltage is present, test
the coil with screwdriver.
The screwdriver should
magnetically stick inside
the coil. If screwdriver
sticks, then the coil is
good. Replace the plunger
on valve or replace the
complete valve assembly.
See system repair manual.
3A1705J 81