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70
G e o t h e r m a l H e a t i n g a n d Co o l i n g
Trilogy
®
Q-Mode
®
(QE) Series IOM - 60Hz HFC-410A
R e v i s e d : D e c e m b e r 2 2 , 2 0 2 1
Table 16: Troubleshooting (Cont.)
Code
Fault
Mode
Possible Cause
Solution
19
Low Refrigerant Pressure
Differential
ALL
Stuck RV
Replace improperly functioning RV
ALL
Bad compressor
Check compressor to ensure it is operating.
20
ECM configuration fault (any)
HT, CL
Incorrect unit configuration
Check unit size
HT, CL
Incorrect motor size
Check motor size
21
High Blower Static
HT, CL
Plugged air filter
Clean or replace air filter
HT, CL
Bad duct work
Correct duct work.
22
Grundfos Flow Sensor
ALL
Bad tranducer
If supply voltage across BRN and WHT wires reads 4.75-5.25 VDC
but a signal is not present, replace sensor
ALL
Bad wiring harness
Check harness
ALL
Bad EXM
If supply voltage across BRN and WHT doesn’t read 4.75-5.25 VDC
replace EXM
23
Grundfos Pressure Sensor
ALL
Bad tranducer
If supply voltage across BRN and WHT wires reads 4.75-5.25 VDC
but a signal is not present, replace sensor
ALL
Bad wiring harness
Check harness
ALL
Bad EXM
If supply voltage across BRN and WHT doesn’t read 4.75-5.25 VDC
replace EXM
24
Leaving Air temp Sensor
ALL
Bad thermistor
Check temp vs. resistance curve per calculator
ALL
Bad wiring harness
Check wiring harness
ALL
Bad EXM
If harness and sensor are fine, board is bad. Replace EXM
25
High EWT Warning
ALL
High EWT
Bring water temp within design parameters
26
Low EWT Warning
ALL
Low EWT
Bring water temp within design parameters
27
Cabinet temp Sensor
ALL
Bad thermistor
Check temp vs. resistance curve per calculator
ALL
Bad wiring harness
Check wiring harness
ALL
Bad EXM
If harness and sensor are fine, board is bad. Replace EXM
28
No Loop Pump Feedback
ALL
No line voltage
Check power cable or unit voltage
ALL
Control signal cable
Check signal cable and verify that voltage is between 3-4 VDC with
the pump OFF and between 0-2 VDC with the pump ON.
ALL
Bad EXM
If a feedback signal is present but the EXM doesn’t read it properly the
board is damaged. Replace the EXM.
29
Low Loop Pump Voltage
ALL
Low pump voltage
Check line voltage to the pump and increase
30
Loop Pump Locked Rotor
ALL
contaminants or trash in the
pump impeller
Remove the pump head, clean out contaminants and flush system
ALL
Seized impeller
Replace pump.
31
Loop Pump Voltage Shutdown
ALL
Low pump voltage
Check line voltage to the pump
32
Loop Pump Sensor
ALL
Bad RPM sensor
Replace pump if the line voltage and control signal is present at the
pump but it doesn’t operate.
33
No DHW Pump Feedback
HW
No line voltage
Check power cable or unit voltage
HW
Control signal cable
Check signal cable and verify that voltage is between 3-4 VDC with
the pump OFF and between 0-2 VDC with the pump ON.
HW
Bad EXM
If a feedback signal is present but the EXM doesn’t read it properly the
board is damaged. Replace the EXM.
34
Low DHW Pump Voltage
HW
Low pump voltage
Check line voltage to the pump and increase
Содержание Trilogy Q-Mode (QE) Series
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