Comfort-Aire HKV300A - Manual (Page 49)

Installation, Operation & Maintenance HKV SERIES Heat Controller, LLC
48
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 CXM/DXM
Check primary/secondary voltage on transformer
HP Fault-Code 2 X Reduced or no water flow Check pump operation or valve operation/setting
High pressure in cooling 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 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 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
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
FP1 Fault - Code 4 X Reduced or no water flow Check pump operation or water valve operation/setting
Water Coil low
temperature limit
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 temperature limit setting
(30°F vs 10°F [-1°C vs -12°C])
Clip JW3 jumper for antifreeze (10°F [-12°C]) use
X Water Temperature out of range Bring water temp within design parameters
X X Bad thermistor Check temp and impedance correlation per chart
FP2 fault - Code 5 X Reduced or no Air flow Check for dirty air filter and clean or replace
Air Coil low
temperature limit
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 temperature limit setting
(30°F vs 10°F [-1°C vs -12°C])
Normal airside applications will require 30°F [-1°C] only
X X Bad thermistor Check temp and impedance correlation per chart
Condensate Fault-Code 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
Unit Performance
Sentinel-Code 8 X Heating mode FP2>125°F [52°C] Check for poor air flow or overcharged unit.
;
Cooling Mode FP1>125°F [52°C]
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Plugged Air Filter
Restricted Return Air Flow
X X
X X
Replace Air Filter
Find & eliminate restriction. Increase return duct
and/or grille size.
Functional Troubleshooting