Heat Controller HEV/H manual Functional Troubleshooting, Fault Htg Clg Possible Cause Solution

Installation, Operation & Maintenance				HEV/H SERIES	Heat Controller, Inc.
		FUNCTIONAL TROUBLESHOOTING
	Fault	Htg	Clg	Possible Cause	Solution
					Check Line Voltage circuit breaker and disconnect
	Main Power Problems	X	X	Green status LED off	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
			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	Bring water temp within design parameters
				cooling
					Check for dirty air filter and clean or replace
	HP Fault Code 2	X		Reduced or no air flow	Check fan motor operation and airflow restrictions
	High Pressure			in heating	Dirty air coil- construction dust etc.
					Too high of external static. Check static vs blower table
		X		Air t emperature out of range in	Bring return air temp within design parameters
				heating
		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	X	X	Insufficient charge	Check for refrigerant leaks
				Compressor pump down at start-	Check charge and start-up water flow
	Low Pressure/Loss of Charge	X
				up
				Reduced or no water flow	Check pump operation or water valve operation/setting
		X			Plugged strainer or filter - clean or replace
				in heating
	LT1 Fault - Code 4				Check water flow adjust to proper flow rate
	Water Low Temperature	X		Inadequate anti-freeze level	Check antifreeze density with hydrometer
		X		Improper low temperature setting	Clip LT1 jumper for antifreeze (10°F) use
				(30°F vs 10°F)
		X		Water t emperature out of range	Bring water temp within design parameters
		X	X	Bad thermistor	Check temp and impedance correlation per chart
				Reduced or no air flow	Check for dirty air filter and clean or replace
			X		Check fan motor operation and airflow restrictions
				in cooling
					Too high of external static - check static vs blower table
	LT2 Fault - Code 5		X	Air temperature out of range	Too much cold vent air - bring entering air temp within
					design parameters
	Low Air Temperature
			X	Improper low temperature setting	Normal airside applications will require 30°F only
				(30°F vs 10°F)
		X	X	Bad thermistor	Check temp and impedance correlation per chart
		X	X	Blocked drain	Check for blockage and clean drain
		X	X	Improper trap	Check trap dimensions and location ahead of vent
					Check for piping slope away from unit
	Condensate Fault-Code 6		X	Poor drainage	Check slope of unit toward outlet
					Poor venting - check vent location
	High Condensate Level		X	Moisture on sensor	Check for moisture shorting to air coil
		X	X	Plugged air filter	Replace air filter
		X	X	Restricted return air flow	Find and eliminate rectriction - increase return duct
					and/or grille size
					Check power supply and 24VAC voltage before and during
					operation
		X	X	Under voltage	Check power supply wire size
	Over/Under Voltage-Code 7				Check compressor starting. Need hard start kit?
					Check 24VAC and unit transformer tap for correct power
	(Auto Resetting)
					supply voltage
					Check power supply voltage and 24VAC before and during
		X	X	Over voltage	operation.
					Check 24VAC and unit transformer tap for correct power
					supply voltage
	Unit Performance	X		Heating Mode LT2>125°F	Check for poor air flow or overcharged unit
	Sentinel-Code 8		X	Cooling Mode LT1>125°F OR	Check for poor water flow, or air flow
				LT2< 40°F
	Swapped Thermistor	X	X	LT1 and LT2 swapped	Reverse position of thermistors
	Code 9
		X	X	Blower does not operate	Check blower line voltage
					Check blower low voltage wiring
	ECM Fault - Code 10			Blower operating with incorrect	Wrong unit size selection
				airflow
					Wrong unit family selection
					Wrong motor size
					Incorrect blower selection
					C

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