Graco Reactor E-XP1 Troubleshooting Manual page 16

Reactor Error Code Trouble Shooting Guide
E04: Fluid Temperature Sensor (FTS), or "A" or "B"
Thermocouple not Connected.
Note: The display that is showing the E04 error is the zone that is seeing the error.
Causes:
1) E04 on the "A" or "B" display = While the unit was powered on, the thermocouple
lost communication with the temperature control module.
 Checking the "A" and "B" side thermocouple assemblies.
 Check the electrical connections at the temperature control module.
o Remove plug J1/SENSOR B (Green 12-pin terminal block) from the
temperature control module and make sure all pins are securely connected.
o Check the "A" & "B" thermocouples by removing the J1/SENSOR B
connector from the temperature control module and check the pins with an
ohmmeter.
Rev 2.6 (02/2014)
 Pin 5 Thermocouple A - red wire connected.
 Pin 6 Thermocouple A - yellow wire connected.
 Pin 8 Thermocouple B - red wire connected.
 Pin 9 Thermocouple B - yellow wire connected.
"A" thermocouple:
 With J1/SENSOR B disconnected measure the resistance across pins 5
& 6. It should measure 4 - 6 Ohms at ambient temperature. If not,
replace the "A" thermocouple.
 Measure the resistance between Pin 5 & the thermocouple housing.
And then between Pin 6 & the thermocouple housing. It should be
"OL" open loop, if not replace the "A" thermocouple.
"B" thermocouple:
 With J1/SENSOR B disconnected measure the resistance across pins 8
& 9. It should measure 4 - 6 Ohms at ambient temperature. If not,
replace the "B" thermocouple.
 Measure the resistance between Pin 8 & the thermocouple housing.
And then between Pin 9 & the thermocouple housing. It should be
"OL open loop, if not replace the "B" thermocouple.
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