Graco FOAM-CAT 200 Series, Instructions And Parts List

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308219
Troubleshooting
Problem Cause Solution
Temperature erratic or inaccurate Sensor probe (256) out of position Probe must protrude 1.44” (36 mm) from
manifold. See Fig. 16, page 27.
Indicator light should go out within 5 seconds of
shutting gun off after flowing.
Heater out of calibration Calibrate controls. See page 32.
Improper incoming voltage Check the wiring and the voltage:
200–240 VRMs during fluid flow and at stall.
See
Adjust the Heater , Step 1, page 16.
One thermostat open (normally
closed),
Model 235260 & 235840
only
Reset thermostat by pushing reset button. See
Fig. 14, page 26.
Faulty sensor probe (256) Check resistance. See page 20.
Replace. See page 27.
Large pressure difference between
ISO and RES side, For example: Thermostat(s) (252) open Reset thermostat by pushing reset button. See
Fig. 14, page 26.
600 psi (4.2 MPa, 42 bar) ISO
1000 psi (7 MPa, 70 bar) RES
Fluid on high pressure side is too
thick Increase heater temperature on high pressure
side to reduce viscosity, which should level the
pressure, OR lower the temperature on the low
pressure side.
WARNING: As this problem
can be caused by clogged or
blocked parts, take special care
and follow the
Pressure Relief
Procedure page 6 before
Gun nozzle impingers clogged or
damaged Clean nozzle. Using an oversized cleanout pin
or damaging nozzle during cleaning may
increase impinger hole size and cause an
imbalance of fluid. See gun manual 307546.
Procedure , page 6, before
checking, cleaning or clearing parts
to help reduce the risk of serious
injury, including injection.
Blocked filters Check outlet filter (112; also see manual
307273).
Check gun check valve screen. See gun
manual 307546.
Clogged hoses Flush clean, if possible, or replace hose. Use
and clean filters regularly. Don’t allow mixed
fluid to back up into hoses.
Fluid supply low or empty Refill; prime system to remove air.
Fluid pump or hose connections
leaking Check for leaks and repair or tighten as
needed. See pump manual also.