Graco 259079 Operation Manuals page 80

Troubleshooting
Error Error Type
Code Position
T2AE Heat DEVIATION
Exchanger
T2BE
T2DA Boost A ALARM
T2DB Boost B
T2DH Hose
T2DE Heat ADVISORY Low Temperature
Exchanger
80
Name Cause
Low Temperature Coolant circulation pump
Hx A not working.
Air lock in circulation
pump.
Low Temperature No voltage to coil of
Hx B valve.
Low Chemical Flow is too high at current
Temperature setpoint.
Bad heater(s)
Radiator fan will not stop. Replace fan relay.
Coolant Outlet
Engine thermostat is
stuck open.
Solution
Check for 240VAC on pump.
If there is the correct voltage,
replace circulation pump.
Check for coolant flow in
sight glass.
Turn on the manual valve
switch (MV), on the load
center, to manually turn
on the solenoids and see
if the temp rises. If not,
check voltage output on J6
connector on the load center
and ensure the LEDS are
on. If not, Replace the load
center board. See system
repair manual.
If voltage is present,
measure the resistance
of the coil, it should be 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,
replace the plunger on valve
or replace the complete
valve assembly.
Use a smaller mix chamber
that is rated for the unit in
use.
Confirm resistance of heater
is 23–26.5 ohms. Replace if
OL/open loop.
Replace thermostat. See
Perkins distributor to
replace.
3A1705E