63
c l i m a t e m a s t e r.c o m
Tranquility
®
22 Digital (TZ
)
Series - 60Hz
R e v. : N o v e m b e r 1 8 , 2 0 2 2
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 DXM2.5
Check primary/secondary voltage on transformer.
HP Fault
Code 2
High Pressure
X
Reduced or no water flow
in cooling
Check pump operation or valve operation/setting.
Check water flow adjust to proper flow rate.
X
Water Temperature out of
range in cooling
Bring water temp within design parameters.
X
Reduced or no airflow
in heating
Check for dirty air filter and clean or replace.
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 temperature 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.
X
Frozen water heat exchanger
Thaw heat exchanger.
X
X
Bad HPWS Switch
Replace HPWS Switch.
LP/LOC Fault
Code 3
Low Pressure /
Loss of Charge
X
X
Insufficient charge
Check for refrigerant leaks
X
Compressor pump down
at start-up
Check charge and start-up water flow.
LT1 Fault
Code 4
Water Low
Temperature
X
Reduced or no water flow
in heating
Check pump operation or water valve operation/setting.
Plugged strainer or filter? Clean or replace.
Check water flow. Adjust to proper flow rate.
X
Inadequate antifreeze 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 temperature 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 airflow in cooling
Check for dirty air filter and clean or replace.
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 6
High Condensate Level
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.
X
X
Plugged air filter
Replace air filter.
X
X
Restricted return airflow
Find and eliminate restriction. Increase return duct and/or grille size.
Table continued on next page.