Reactor Error Code Trouble Shooting Guide
Rev 2.6 (02/2014) Page 16
E04: Fluid Temperature Sensor (FTS), or “A” or “B”
Thermocouple not Connected. (Return to Table Of Contents)
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.
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.
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.
“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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