ClimateMaster Trilogy Q-Mode (QE) Series, Manual

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68 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
Code Fault Mode Possible Cause Solution
2 High Discharge Pressure
CL Reduced or no water flow Check loop pump operation
CL Reduced or no water flow Check water flow and adjust to proper flow rate
CL, HW Water temp out of range Bring water temp within design parameters
HW Reduced or no water flow Check HW pump operation
HW Reduced or no water flow Check water flow and adjust to proper flow rate
HT Reduced or no air flow Check for dirty air filter - clean or replace
HT Reduced or no air flow Check fan motor operation and air flow restrictions
HT Reduced or no air flow Dirty air coil
HT Reduced or no air flow External static is too high - correct duct work
HT Air temp out of range Bring air temp within design parameters
ALL Overcharged Check superheat and subcooling vs. manual mode operating condition
table
ALL Faulty discharge transducer Check transducer
3 Low Suction Pressure
ALL Insufficient charge Check for refrigerant leaks
HT, HW Incorrect loop configuration Check freeze protection trip point setting
HT, HW Reduced or no water flow Check loop pump operation
HT, HW Reduced or no water flow Check water flow and adjust to proper flow rate
CL, HW Reduced or no air flow Check for dirty air filter - clean or replace
CL, HW Reduced or no air flow Check fan motor operation and air flow restrictions
CL, HW Reduced or no air flow Dirty air coil
CL, HW Reduced or no air flow External static is too high - correct duct work
HT, HW 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, HW Improperly functioning EEV1 Check output signal from EXM.
CL, HW 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, HW Improperly functioning EEV2 Check output signal from EXM.
HT, HW Water temp out of range Bring water temp within design parameters
CL, HW 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.
6 Condensate Overflow
ALL Blocked Drain Check for blockage and clean drain.
ALL Improper Trap Check trap dimensions and location ahead of vent
CL, HW Poor drainage Check for piping slope away from unit
CL, HW Poor drainage Check slope of unit towards outlet
CL, HW Poor drainage Poor venting - check vent location
CL, HW Moisture on sensor Check for moisture shorting to air coil
ALL Plugged air filter Clean or replace air filter
ALL Restricted return air flow Find and eliminate restriction - increaes return duct and/or grille size
7 Over / Under Voltage
ALL Under voltage Check power supply and 24Vac before and during operation
ALL Under voltage Check power supply wires
ALL Under voltage Check 24Vac transformer tap for correct power supply voltage
ALL Over voltage Check power supply and 24Vac before and during operation
ALL Over voltage Check 24Vac transformer tap for correct power supply voltage