55
c l i m a t e m a s t e r. c o m
Trilogy
®
Variable
(VE) Series IOM - 60Hz HFC-410A
C r e a t e d : 4 O c t o b e r, 2 0 1 9
Troubleshooting
Code
Fault
Mode
Possible Cause
Solution
52
Low Suction Pressure Warning
HT
Low LWT
Bring water temp within design parameters
ALL
Insufficient charge
Check for refrigerant leaks
HT
Incorrect loop configuration
Check freeze protection trip point setting
HT
Reduced or no water flow
Check loop pump operation
HT
Reduced or no water flow
Check water flow and adjust to proper flow rate
CL
Reduced or no air flow
Check for dirty air filter - clean or replace
CL
Reduced or no air flow
Check fan motor operation and air flow restrictions
CL
Reduced or no air flow
Dirty air coil
CL
Reduced or no air flow
External static is too high - correct duct work
HT
Improperly functioning EEV1
Check coil windings with ohmmeter. WHITE/RED, GREEN/RED, YELLOW/
VIOLET, and BLUE/VIOLET should each read between 36 and 44 ohms.
HT
Improperly functioning EEV1
Check output signal from EXM.
CL
Improperly functioning EEV2
Check coil windings with ohmmeter. WHITE/RED, GREEN/RED, YELLOW/
VIOLET, and BLUE/VIOLET should each read between 36 and 44 ohms.
CL
Improperly functioning EEV2
Check output signal from EXM.
HT
Water temp out of range
Bring water temp within design parameters
CL
Air temp out of range
Bring air temp within design parameters
ALL
Faulty suction transducer
Check transducer
ALL
Faulty check valve
Check different operational modes to isolate valve
ALL
Restriction after the EEV
Check for temperature drop at various sections along refrigerant circuit. i.e.,
across filter-dryer, etc.
53
Low Discharge Pressure
Warning
CL
Low EWT
Bring water temp within design parameters
HT
Low EAT
Bring air temp within design parameters
57
Low Discharge Superheat
ALL
Faulty EEV
Check EEV operation
ALL
Bad discharge pressure
transducer
Troubleshoot transducer
ALL
Bad discharge temp sensor
Check temp vs. resistance curve per calculator
ALL
Improperly installed discharge
temp sensor
Check location and position of temp sensor
58
Low Suction Superheat
ALL
Faulty EEV
Check EEV operation
ALL
Bad suction pressure trans-
ducer
Troubleshoot transducer
ALL
Bad suction temp sensor
Check temp vs. resistance curve per calculator
ALL
Improperly installed suction
temp sensor
Check location and position of temp sensor
59
High Suction Superheat
ALL
Faulty EEV
Check EEV operation
ALL
Low charge
Check unit capacity in mode check
ALL
Bad suction pressure
transducer
Troubleshoot transducer
ALL
Bad suction temp sensor
Check temp vs. resistance curve per calculator
ALL
Improperly installed suction
temp sensor
Check location and position of temp sensor
60
General Compressor Fault
ALL
Check compressor sub faults
See Low Level sub-faults (codes 61-71, 75 and 76)
