Graco Therm-O-Flow 200, Instructions-Parts List Manual, Page: 41 / 109

Troubleshooting
Code Code Code Description Description
Description
Type Type
Type
Cause Cause Cause Solution Solution Solution
Reduce flow rate.
Increase temperature of accessory upstream.
Faulty accessory heater measure resistance between
heater leads.
Change Low Temp Alarm Offset.
T1 _ Low Temp. Unit
_ Zone _ Alarm Zone
temperature
too low
Replace accessory.
Reduce flow rate.
Change Low Temp Deviation Offset.
T2 _ Low Temp. Unit
_ Zone _ Deviation Zone
temperature
too low
Add zone (temperature) upstream.
Change High Temp Deviation Offset. T3 _ High Temp.
Unit _ Zone _ Deviation Temperature
reading has
risen too high
Verify setpoint upstream is not hotter than this zone’s
setpoint.
Ensure inlet and outlets are not obstructed.
T4C# AWB
Temperature
Runaway
Transformer Alarm Cooling fan
not working
or inlet is
blocked/dirty
Verify fan is plugged in.
Ensure inlet and outlets are not obstructed. T4M# AWB High
Transformer
Temp Alarm Transformer
Temperature
is too High
Verify fan is plugged in.
Change High Temp Alarm Offset. T4 _ High Temp.
Unit _ Zone _ Alarm Temperature
reading has
risen too high
Verify setpoint upstream is not hotter than this zone’s
setpoint.
Check RTD wiring and harness/connector integrity.
T6 _
Sensor Err. Unit
_ Zone _
Alarm Bad RTD
Reading
Replace RTD.
T6C# AWB Invalid
Thermistor
Reading Alarm Transformer
thermistor
temperature
is incorrect Verify thermister is securely connected to J7 of the
AWB. Replace transformer if necessary.
Check fuses on MZLP connected to that Zone.
Check wiring to device.
T8V _ No Temp. Rise
Unit _ Zone _ Alarm Temperature
reading does
not change.
Check heater resistance on device.
V1I# Low CAN
Voltage, MZLP
_ Alarm Bad or
overloaded
power supply Verify power supply voltage is 24 VDC. If voltage is
low, disconnect the power lines and re-check voltage
reading. If voltage is still low, replace power supply. If
voltage is correct after disconnecting the power lines.
Connect items one at a time until the voltage drops
to isolate the bad module.
V1M# Low Voltage
Line AWB, Unit
_ Deviation The voltage
to the AWB
is below
threshold Verify transformer voltage top matches incoming
voltage. Verify incoming voltage is correct.
V4I# High CAN
Voltage, MZLP
_ Alarm Bad or
overloaded
power supply Verify power supply voltage is 24 VDC. If voltage is
high, replace power supply unit.
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