Graco InvisiPac HM10 Instructions Manual page 78

Error Codes
Code Description
T4D(C) High Temperature:
Applicator Zone or
Hose Zone
T4MX High Temperature:
Transformer
T6D0 Sensor Error: Melter
T6D(C) Sensor Error:
Applicator Zone or
Hose Zone
T6MX Sensor Error:
Transformer
T8D0 No Temperature:
Rise Melter
T8D(C) No Temperature:
Applicator Zone or
Hose Zone
(C): Channel and component-specific error. See Zone (C) Lookup Table, page 74 for component error zone.
* Does not shut down system or melter zone
78
Cause
An applicator or hose
temperature deviated
above setpoint
Transformer thermistor
reads above 212°F (100°C)
No reading from the melter
temperature sensor (RTD)
No reading from an
applicator or hose RTD
No reading from
transformer thermistor
The melter temperature
reading does not increase
toward setpoint.
The applicator or hose
temperature reading does
not increase toward
setpoint.
Solution
✓Install a properly functioning applicator or hose.
✓Turn on the system without dispensing. Verify
the hose maintains a stable setpoint temperature.
✓Verify the melter temperature setting is not set
above the hose.
✓Check the applicator temperature sensor RTD.
See Typical Hose and Applicator Wiring,
page 106.
✓Verify the transformer fan is free of obstructions.
✓Fan only spins when the transformer is warm,
and for a 5 second check each time electrical
power is cycled
✓Verify the melter temperature sensor (RTD)
connection to J1-RTD1 on the AMZ circuit board.
See Common Schematic, page 105
✓Check the melter temperature sensor RTD for
continuity.
✓Replace the melter temperature sensor RTD.
See Replace the Temperature Sensor (RTD),
page 85.
✓Verify hose and applicator connections. See
Typical Hose and Applicator Wiring, page 106.
✓Install a properly functioning applicator or hose.
✓Verify temperature sensor connection to J2 on
the AMZ circuit board.
✓Check the transformer sensor wiring for
damage.
✓See Incoming Power: 480V Models, page 106.
✓Check that the temperature sensor RTD is
installed in the melter.
✓Compare temperature displayed on screen and
the actual melter temperature.
✓Replace the temperature sensor RTD. See
Replace the Temperature Sensor (RTD),
page 85.
✓Verify the component is not wet.
✓Install a properly functioning applicator or hose.
✓Check gun heater rods for proper resistance.
3A7259C