Graco Therm-O-Flow 200 Instructions-Parts List Manual page 41

Code Description
A3MF AWB Clean Fan Filter Alarm
A4 _ High Current Unit _
Zone _
A4C# High Current Fan
AWB, Unit _
A7 _ Unexp. Curr. Unit _
Zone _
No Current Unit _
A8 _
Zone _
A8C AWB No Fan Current Alarm
AM3# High Current SSR
MZLP _
AM4# High Current
Contactor MZLP _
AM8# No Current Contactor
MZLP _
CAC# Comm Error MZLP _
334130W
Type Cause
Cooling inlet
screen is dirty
Alarm Defective or
shorted to
ground on
zone
Deviation Fan is drawing
too much
current
Alarm Unexpected
current flow to
zone
No Current
Flow to the
Zone
Alarm
Cooling Fan
not Working
Alarm Excessive
current flow in
the SSR
Alarm Defective or
shorted to
ground on
MZLP
Alarm No Current
Flow to the
Contactor
Alarm System not
responding to
ADM.
Solution
Clean inlet screen.
Verify accessory is rated for 240 VAC.
Verify heater resistance and check for shorts to
ground. Replace as necessary.
Verify there is not an air obstruction at the
inlet/outlet of enclosure. Verify nothing is
preventing fan rotation. Replace fan if
necessary.
Replace MZLP.
Faulty accessory heater. Measure resistance to
ground between heater leads.
Verify cable is plugged into zones 3-4.
Replace heater if necessary.
See MZLP-1 notes page 14.
Check for loose or disconnected wires or
plugs.
Check for blown fuses on MZLP.
Check heater resistance for open circuit.
Check for shorts between heater and ground.
Verify fan is plugged in. Replace if necessary.
Check for shorts in harness to SSR. Check
polarity of wiring to SSR. Replace if necessary.
Check for shorts in the harness to contactor.
Check the polarity to contactor. Replace
contactor if necessary.
Ensure harness to MZLP is connected. Ensure
wiring to contactor is secure. Replace
contactor if necessary.
System is not properly loaded with correct
Software.
Dial not set correct on MZLP. Duplicate MZLP
dial
positions (i.e. 1 to 1, 2 to 2, ect).
Check all CAN connections between the ADM
and missing MZLP.
Check if hardware exists on the network.
Replace MZLP if necessary.
Troubleshooting
41