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C l i m a t e M a s t e r W a t e r- S o u r c e H e a t P u m p s
C L I M A T E M A S T E R W A T E R - S O U R C E H E A T P U M P S
Tr a n q u i l i t y
®
2 2 ( T Z ) S e r i e s
R e v i s e d : 0 1 / 2 1 / 1 3
Functional Troubleshooting
Fault
Htg Clg Possible Cause
Solution
Main Power Problems
X
X
Green status LED off
Check Line Voltage circuit breaker and disconnect
Check for line voltage between L1 and L2 on the contactor
Check for 24VAC between R and C on DXM
Check primary/secondary voltage on transformer
HP Fault Code 2
X
Reduced or no water flow
Check pump operation or valve operation/setting
in cooling
Check water flow adjust to proper flow rate
X
Water t emperature out of range in
cooling
Bring water temp within design parameters
X
Reduced or no air flow
Check for dirty air filter and clean or replace
in heating
Check fan motor operation and airflow restrictions
Dirty air coil- construction dust etc.
Too high of external static. Check static vs blower table
X
Air t emperature out of range in
heating
Bring return air temp within design parameters
X
X
Overcharged with refrigerant
Check superheat/subcooling vs typical operating condition
table
X
X
Bad HP switch
Check switch continuity and operation - Replace
LP/LOC Fault-Code 3
X
X
Insufficient charge
Check for refrigerant leaks
Low Pressure/Loss of Charge
X
Compressor pump down at start-
up
Check charge and start-up water flow
LT1 Fault - Code 4
X
Reduced or no water flow
Check pump operation or water valve operation/setting
Water Low Temperature
in heating
Plugged strainer or filter - clean or replace
Check water flow adjust to proper flow rate
X
Inadequate anti-freeze level
Check antifreeze density with hydrometer
X
Improper low temperature setting
(30°F vs 10°F)
Clip LT1 jumper for antifreeze (10°F) use
X
Water t emperature out of range
Bring water temp within design parameters
X
X
Bad thermistor
Check temp and impedance correlation per chart
LT2 Fault - Code 5
Low Air Temperature
X
Reduced or no air flow
Check for dirty air filter and clean or replace
in cooling
Check fan motor operation and airflow restrictions
Too high of external static - check static vs blower table
X
Air temperature out of range
Too much cold vent air - bring entering air temp within
design parameters
X
Improper low temperature setting
(30°F vs 10°F)
Normal airside applications will require 30°F only
X
X
Bad thermistor
Check temp and impedance correlation per chart
Condensate Fault-Code
High Condensate Level
6
X
X
Blocked drain
Check for blockage and clean drain
X
X
Improper trap
Check trap dimensions and location ahead of vent
X
Poor drainage
Check for piping slope away from unit
Check slope of unit toward outlet
Poor venting - check vent location
X
Moisture on sensor
Check for moisture shorting to air coil
Over/Under Voltage-Code 7
X
X
Under voltage
Check power supply and 24VAC voltage before and during
operation
(Auto Resetting)
Check power supply wire size
Check compressor starting. Need hard start kit?
Check 24VAC and unit transformer tap for correct power
supply voltage
X
X
Over voltage
Check power supply voltage and 24VAC before and during
operation.
Check 24VAC and unit transformer tap for correct power
supply voltage
X
X
Plugged air filter
X
X
Restricted return air flow
Replace air filter
Find and eliminate rectriction - increase return duct
and/or grille size
High Pressure
X
Frozen water heat exchanger
Thaw heat exchanger
X
X
Bad HPWS Switch
Replace HPWS Switch
