Functional And Performance Troubleshooting - Heat Controller HTV Series Installation, Operation & Maintenance Instructions Manual

Functional Troubleshooting
Fault
Main Power Problems
HP Fault - Code 2
High Pressure
LP/LOC Fault- Code 3
Low Pressure/Loss of
Charge
FP1 Fault - Code 4
Water Coil -
Low Temperature Limit
FP2 - Code 5
Air Coil
Low Temperature Limit
HTV/HTD/HTH SERIES
FUNCTIONAL TROUBLESHOOTING
Htg Clg Possible Cause
X X Green Status Led Off
X Reduced Or No Water Flow In Cooling
X Water Temperature Out Of Range In
Cooling
X Reduced Or No Air Flow In Heating
X Air Temperature Out Of Range In Heating
X X Overcharged With Refrigerant
X X Bad Hp Switch
X X Insufficient Charge
X Compressor Pump Down At Start-Up
X Reduced Or No Water Flow In Heating
X Inadequate Anti-Freeze Level
X Improper Temperature Limit Setting (30°F
Vs. 10°F)
X Water Temperature Out of Range
X X Bad Thermistor
X Reduced Or No Air Flow In Cooling
X Air Temperature Out Of Range
X Improper Temperature Limit Setting (30°F
Vs. 10°F)
X X Bad Thermistor
Check line voltage circuit breaker and cisconnect
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
Check water flow adjust to proper flow rate
Bring water temp within design parameters
Check for dirty air filter and clean or replace
Check fan motor operation and airflow restriction
Dirty Air coil - construction dust etc.
Too high of external static. Check static valve
Bring return air temp within design parameters
Check superheat/subcooling vs. typical operation
table
Check switch continuity and operation. Replace
Check for refrigerant leaks
Check charge and start-up water flow
Check pump operation or water valve operation
Plugged strainer or filter. Clean or replace
Check water flow adjust to proper flow rate
Check antifreeze density with hydrometer
Clip JW3 jumper for antifreeze (10°F)
Bring water temp within design parameters
Check temp and impedance correlation per chart
Check for dirty air filter and clean or replace
Check fan motor operation and airflow restriction
Too high of external static. Check static valve
Too much cold vent air? Bring entering air to design
parameters
Normal airside applications will require 30°F
Check temp and impedance correlation per chart
42
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Heat Controller, Inc.
Solution