HTV/HTD/HTH SERIES Heat Controller, Inc.
45
Fault Htg Clg Possible Cause Solution
Check line voltage circuit breaker and cisconnect Main Power Problems X X Green Status Led Off
Check for line voltage between L1 and L2 on
Check for 24 VAC between R and C on CXM
Check primary/secondary voltage on transformer
Check pump operation or valve operation/setting
X Reduced Or No Water Flow In Cooling
Check water flow adjust to proper flow rate
X
HP Fault - Code 2
High Pressure
Water Temperature Out Of Range In
Cooling
Bring water temp within design parameters
Check for dirty air filter and clean or replace X Reduced Or No Air Flow In Heating
Check fan motor operation and airflow restriction
Dirty Air coil - construction dust etc.
Too high of external static. Check static valve
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 operation
table
X X Bad Hp Switch Check switch continuity and operation. Replace
X X Insufficient Charge Check for refrigerant leaks LP/LOC Fault- Code 3
Low Pressure/Loss of
Charge
X Compressor Pump Down At Start-Up Check charge and start-up water flow
Check pump operation or water valve operation
Plugged strainer or filter. Clean or replace
X Reduced Or No Water Flow In Heating
Check water flow adjust to proper flow rate
X Inadequate Anti-Freeze Level Check antifreeze density with hydrometer
X Improper Temperature Limit Setting (30°F
Vs. 10°F)
Clip JW3 jumper for antifreeze (10°F)
X Water Temperature Out of Range Bring water temp within design parameters
FP1 Fault - Code 4
Water Coil -
Low Temperature Limit
X X Bad Thermistor Check temp and impedance correlation per chart
Check for dirty air filter and clean or replace
Check fan motor operation and airflow restriction
X Reduced Or No Air Flow In Cooling
Too high of external static. Check static valve
X Air Temperature Out Of Range Too much cold vent air? Bring entering air to design
parameters
X Improper Temperature Limit Setting (30°F
Vs. 10°F)
Normal airside applications will require 30°F
FP2 - Code 5
Air Coil
Low Temperature Limit
X X Bad Thermistor Check temp and impedance correlation per chart
FUNCTIONAL TROUBLESHOOTING
Functional Troubleshooting
To Next Page
Loading...
